From 332cdc856aa3308e5dcc71870df53c4df3a517c8 Mon Sep 17 00:00:00 2001
From: Andrea Verlicchi <verlicchia@yoox.net>
Date: Mon, 30 Jul 2018 17:43:04 +0200
Subject: [PATCH 01/12] Restored .min.js in demos

---
 demos/callbacks.html               |   2 +-
 demos/callbacks_picture.html       |   2 +-
 demos/dynamic_content.html         |  35 ++++--
 demos/dynamic_content_nodeset.html |  35 ++++--
 demos/load.html                    |   2 +-
 demos/load_all.html                | 181 +++++++++++++++++++++--------
 demos/video.html                   |  18 ++-
 7 files changed, 191 insertions(+), 84 deletions(-)
diff --git a/demos/callbacks.html b/demos/callbacks.html
index 43f74f1b..4950261d 100644
--- a/demos/callbacks.html
+++ b/demos/callbacks.html
@@ -249,7 +249,7 @@
 			</li>
 		</ul>
 	</div>
-	<script src="../dist/lazyload.js"></script>
+	<script src="../dist/lazyload.min.js"></script>
 	<script>
 		(function () {
 			function logElementEvent(eventName, element) {
diff --git a/demos/callbacks_picture.html b/demos/callbacks_picture.html
index 8c331c16..646e032a 100644
--- a/demos/callbacks_picture.html
+++ b/demos/callbacks_picture.html
@@ -490,7 +490,7 @@
 			</li>
 		</ul>
 	</div>
-	<script src="../dist/lazyload.js"></script>
+	<script src="../dist/lazyload.min.js"></script>
 	<script>
 		(function () {
 			function logElementEvent(eventName, element) {
diff --git a/demos/dynamic_content.html b/demos/dynamic_content.html
index 82d507d5..ef178805 100644
--- a/demos/dynamic_content.html
+++ b/demos/dynamic_content.html
@@ -40,34 +40,49 @@
 
 <body>
 	<button id="addContent">
-	ADD CONTENT <span class="count"></span>
-</button>
+		ADD CONTENT
+		<span class="count"></span>
+	</button>
 	<div id="results1" class="results">
 		<ul>
 			<li>
-				<a href="#"><img alt="Stivaletti" data-src="../img/44721746JJ_15_a.jpg" width="220" height="280"></a>
+				<a href="#">
+					<img alt="Stivaletti" data-src="../img/44721746JJ_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#"><img alt="Open toe" data-src="../img/44740806JX_15_r.jpg" width="220" height="280"></a>
+				<a href="#">
+					<img alt="Open toe" data-src="../img/44740806JX_15_r.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#"><img alt="Sneakers &amp; Tennis" data-src="../img/44735977GR_15_a.jpg" width="220" height="280"></a>
+				<a href="#">
+					<img alt="Sneakers &amp; Tennis" data-src="../img/44735977GR_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#"><img alt="Sneakers &amp; Tennis shoes basse" data-src="../img/44738717AM_15_a.jpg" width="220" height="280"></a>
+				<a href="#">
+					<img alt="Sneakers &amp; Tennis shoes basse" data-src="../img/44738717AM_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#"><img alt="Sneakers &amp; Tennis shoes alte" data-src="../img/44739940CB_15_a.jpg" width="220" height="280"></a>
+				<a href="#">
+					<img alt="Sneakers &amp; Tennis shoes alte" data-src="../img/44739940CB_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#"><img alt="Sneakers &amp; Tennis shoes alte" data-src="../img/44740860XG_15_a.jpg" width="220" height="280"></a>
+				<a href="#">
+					<img alt="Sneakers &amp; Tennis shoes alte" data-src="../img/44740860XG_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#"><img alt="Sneakers &amp; Tennis shoes basse" data-src="../img/44738719VN_15_a.jpg" width="220" height="280"></a>
+				<a href="#">
+					<img alt="Sneakers &amp; Tennis shoes basse" data-src="../img/44738719VN_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 		</ul>
 	</div>
-	<script src="../dist/lazyload.js"></script>
+	<script src="../dist/lazyload.min.js"></script>
 	<script>
 		(function () {
 
diff --git a/demos/dynamic_content_nodeset.html b/demos/dynamic_content_nodeset.html
index 69ad9cf7..8229c943 100644
--- a/demos/dynamic_content_nodeset.html
+++ b/demos/dynamic_content_nodeset.html
@@ -40,34 +40,49 @@
 
 <body>
 	<button id="addContent">
-	ADD CONTENT <span class="count"></span>
-</button>
+		ADD CONTENT
+		<span class="count"></span>
+	</button>
 	<div id="results1" class="results">
 		<ul>
 			<li>
-				<a href="#"><img alt="Stivaletti" data-src="../img/44721746JJ_15_a.jpg" width="220" height="280"></a>
+				<a href="#">
+					<img alt="Stivaletti" data-src="../img/44721746JJ_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#"><img alt="Open toe" data-src="../img/44740806JX_15_r.jpg" width="220" height="280"></a>
+				<a href="#">
+					<img alt="Open toe" data-src="../img/44740806JX_15_r.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#"><img alt="Sneakers &amp; Tennis" data-src="../img/44735977GR_15_a.jpg" width="220" height="280"></a>
+				<a href="#">
+					<img alt="Sneakers &amp; Tennis" data-src="../img/44735977GR_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#"><img alt="Sneakers &amp; Tennis shoes basse" data-src="../img/44738717AM_15_a.jpg" width="220" height="280"></a>
+				<a href="#">
+					<img alt="Sneakers &amp; Tennis shoes basse" data-src="../img/44738717AM_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#"><img alt="Sneakers &amp; Tennis shoes alte" data-src="../img/44739940CB_15_a.jpg" width="220" height="280"></a>
+				<a href="#">
+					<img alt="Sneakers &amp; Tennis shoes alte" data-src="../img/44739940CB_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#"><img alt="Sneakers &amp; Tennis shoes alte" data-src="../img/44740860XG_15_a.jpg" width="220" height="280"></a>
+				<a href="#">
+					<img alt="Sneakers &amp; Tennis shoes alte" data-src="../img/44740860XG_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#"><img alt="Sneakers &amp; Tennis shoes basse" data-src="../img/44738719VN_15_a.jpg" width="220" height="280"></a>
+				<a href="#">
+					<img alt="Sneakers &amp; Tennis shoes basse" data-src="../img/44738719VN_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 		</ul>
 	</div>
-	<script src="../dist/lazyload.js"></script>
+	<script src="../dist/lazyload.min.js"></script>
 	<script>
 		(function () {
 
diff --git a/demos/load.html b/demos/load.html
index ce96a5a8..e88afbbe 100644
--- a/demos/load.html
+++ b/demos/load.html
@@ -160,7 +160,7 @@
     </div>
 </body>
 
-<script src="../dist/lazyload.js"></script>
+<script src="../dist/lazyload.min.js"></script>
 <script>
     (function (w, d) {
         const lazyClass = "lazy";
diff --git a/demos/load_all.html b/demos/load_all.html
index 1a1dcbeb..de316c7c 100644
--- a/demos/load_all.html
+++ b/demos/load_all.html
@@ -13,27 +13,28 @@
 			margin: 0;
 			padding: 0;
 		}
-		
+
 		a,
 		img {
 			display: block;
 		}
-		
+
 		img {
 			border: 0;
 		}
-		
+
 		img:not([src]) {
 			visibility: hidden;
 		}
-		
+
 		/* Fixes Firefox anomaly during image load */
+
 		@-moz-document url-prefix() {
 			img:-moz-loading {
 				visibility: hidden;
 			}
 		}
-		
+
 		button {
 			position: fixed;
 			bottom: 10px;
@@ -49,137 +50,217 @@
 	<div id="results1" class="results">
 		<ul>
 			<li>
-				<a href="#/it/donna/stivaletti_cod44721746jj.html"><img alt="Stivaletti" data-src="../img/44721746JJ_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/stivaletti_cod44721746jj.html">
+					<img alt="Stivaletti" data-src="../img/44721746JJ_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/open-toe_cod44740806jx.html"><img alt="Open toe" data-src="../img/44740806JX_15_r.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/open-toe_cod44740806jx.html">
+					<img alt="Open toe" data-src="../img/44740806JX_15_r.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/sneakers-tennis-shoes-basse_cod44735977gr.html"><img alt="Sneakers &amp; Tennis" data-src="../img/44735977GR_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/sneakers-tennis-shoes-basse_cod44735977gr.html">
+					<img alt="Sneakers &amp; Tennis" data-src="../img/44735977GR_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/sneakers-tennis-shoes-basse_cod44738717am.html"><img alt="Sneakers &amp; Tennis shoes basse" data-src="../img/44738717AM_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/sneakers-tennis-shoes-basse_cod44738717am.html">
+					<img alt="Sneakers &amp; Tennis shoes basse" data-src="../img/44738717AM_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/sneakers-tennis-shoes-alte_cod44739940cb.html"><img alt="Sneakers &amp; Tennis shoes alte" data-src="../img/44739940CB_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/sneakers-tennis-shoes-alte_cod44739940cb.html">
+					<img alt="Sneakers &amp; Tennis shoes alte" data-src="../img/44739940CB_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/sneakers-tennis-shoes-alte_cod44740860xg.html"><img alt="Sneakers &amp; Tennis shoes alte" data-src="../img/44740860XG_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/sneakers-tennis-shoes-alte_cod44740860xg.html">
+					<img alt="Sneakers &amp; Tennis shoes alte" data-src="../img/44740860XG_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/sneakers-tennis-shoes-basse_cod44738719vn.html"><img alt="Sneakers &amp; Tennis shoes basse" data-src="../img/44738719VN_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/sneakers-tennis-shoes-basse_cod44738719vn.html">
+					<img alt="Sneakers &amp; Tennis shoes basse" data-src="../img/44738719VN_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/sneakers-tennis-shoes-basse_cod44739938wk.html"><img alt="Sneakers &amp; Tennis shoes basse" data-src="../img/44739938WK_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/sneakers-tennis-shoes-basse_cod44739938wk.html">
+					<img alt="Sneakers &amp; Tennis shoes basse" data-src="../img/44739938WK_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/stivali_cod44736534fq.html"><img alt="Stivali" data-src="../img/44736534FQ_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/stivali_cod44736534fq.html">
+					<img alt="Stivali" data-src="../img/44736534FQ_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/stivali_cod44735388ui.html"><img alt="Stivali" data-src="../img/44735388UI_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/stivali_cod44735388ui.html">
+					<img alt="Stivali" data-src="../img/44735388UI_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/stivaletti_cod44739165ev.html"><img alt="Stivaletti" data-src="../img/44739165EV_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/stivaletti_cod44739165ev.html">
+					<img alt="Stivaletti" data-src="../img/44739165EV_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/stivaletti_cod44739454hf.html"><img alt="Stivaletti" data-src="../img/44739454HF_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/stivaletti_cod44739454hf.html">
+					<img alt="Stivaletti" data-src="../img/44739454HF_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/stivali_cod44719480km.html"><img alt="Stivali" data-src="../img/44719480KM_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/stivali_cod44719480km.html">
+					<img alt="Stivali" data-src="../img/44719480KM_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/stivaletti_cod44719687td.html"><img alt="Stivaletti" data-src="../img/44719687TD_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/stivaletti_cod44719687td.html">
+					<img alt="Stivaletti" data-src="../img/44719687TD_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/decollete_cod44721899ng.html"><img alt="Décolleté" data-src="../img/44721899NG_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/decollete_cod44721899ng.html">
+					<img alt="Décolleté" data-src="../img/44721899NG_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/mocassini_cod44721744sl.html"><img alt="Mocassini" data-src="../img/44721744SL_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/mocassini_cod44721744sl.html">
+					<img alt="Mocassini" data-src="../img/44721744SL_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/stivaletti_cod44716730kr.html"><img alt="Stivaletti" data-src="../img/44716730KR_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/stivaletti_cod44716730kr.html">
+					<img alt="Stivaletti" data-src="../img/44716730KR_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/decollete_cod44718734xl.html"><img alt="Décolleté" data-src="../img/44718734XL_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/decollete_cod44718734xl.html">
+					<img alt="Décolleté" data-src="../img/44718734XL_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/decollete_cod44721796uk.html"><img alt="Décolleté" data-src="../img/44721796UK_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/decollete_cod44721796uk.html">
+					<img alt="Décolleté" data-src="../img/44721796UK_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/francesine_cod44717679mj.html"><img alt="Francesine" data-src="../img/44717679MJ_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/francesine_cod44717679mj.html">
+					<img alt="Francesine" data-src="../img/44717679MJ_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/stivaletti_cod44724594vu.html"><img alt="Stivaletti" data-src="../img/44724594VU_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/stivaletti_cod44724594vu.html">
+					<img alt="Stivaletti" data-src="../img/44724594VU_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/decollete_cod44726148aq.html"><img alt="Décolleté" data-src="../img/44726148AQ_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/decollete_cod44726148aq.html">
+					<img alt="Décolleté" data-src="../img/44726148AQ_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/mocassini_cod44719629nt.html"><img alt="Mocassini" data-src="../img/44719629NT_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/mocassini_cod44719629nt.html">
+					<img alt="Mocassini" data-src="../img/44719629NT_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/mocassini_cod44725329kq.html"><img alt="Mocassini" data-src="../img/44725329KQ_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/mocassini_cod44725329kq.html">
+					<img alt="Mocassini" data-src="../img/44725329KQ_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/stivali_cod44724026qs.html"><img alt="Stivali" data-src="../img/44724026QS_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/stivali_cod44724026qs.html">
+					<img alt="Stivali" data-src="../img/44724026QS_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/stivaletti_cod44720256gw.html"><img alt="Stivaletti" data-src="../img/44720256GW_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/stivaletti_cod44720256gw.html">
+					<img alt="Stivaletti" data-src="../img/44720256GW_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/stivaletti_cod44722062id.html"><img alt="Stivaletti" data-src="../img/44722062ID_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/stivaletti_cod44722062id.html">
+					<img alt="Stivaletti" data-src="../img/44722062ID_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/mocassini_cod44722402rh.html"><img alt="Mocassini" data-src="../img/44722402RH_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/mocassini_cod44722402rh.html">
+					<img alt="Mocassini" data-src="../img/44722402RH_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/stivaletti_cod44726296vu.html"><img alt="Stivaletti" data-src="../img/44726296VU_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/stivaletti_cod44726296vu.html">
+					<img alt="Stivaletti" data-src="../img/44726296VU_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/stivaletti_cod44725755ct.html"><img alt="Stivaletti" data-src="../img/44725755CT_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/stivaletti_cod44725755ct.html">
+					<img alt="Stivaletti" data-src="../img/44725755CT_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/stivaletti_cod44725348nv.html"><img alt="Stivaletti" data-src="../img/44725348NV_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/stivaletti_cod44725348nv.html">
+					<img alt="Stivaletti" data-src="../img/44725348NV_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/stivaletti_cod44721879xx.html"><img alt="Stivaletti" data-src="../img/44721879XX_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/stivaletti_cod44721879xx.html">
+					<img alt="Stivaletti" data-src="../img/44721879XX_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/cuissardes_cod44729472iq.html"><img alt="Cuissardes" data-src="../img/44729472IQ_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/cuissardes_cod44729472iq.html">
+					<img alt="Cuissardes" data-src="../img/44729472IQ_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/decollete_cod44725388jv.html"><img alt="Décolleté" data-src="../img/44725388JV_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/decollete_cod44725388jv.html">
+					<img alt="Décolleté" data-src="../img/44725388JV_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/stivaletti_cod44721854ce.html"><img alt="Stivaletti" data-src="../img/44721854CE_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/stivaletti_cod44721854ce.html">
+					<img alt="Stivaletti" data-src="../img/44721854CE_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/sneakers-tennis-shoes-basse_cod44727690jp.html"><img alt="Sneakers &amp; Tennis shoes basse" data-src="../img/44727690JP_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/sneakers-tennis-shoes-basse_cod44727690jp.html">
+					<img alt="Sneakers &amp; Tennis shoes basse" data-src="../img/44727690JP_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/mocassini_cod44727501hh.html"><img alt="Mocassini" data-src="../img/44727501HH_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/mocassini_cod44727501hh.html">
+					<img alt="Mocassini" data-src="../img/44727501HH_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/sneakers-tennis-shoes-basse_cod44727038aq.html"><img alt="Sneakers &amp; Tennis shoes basse" data-src="../img/44727038AQ_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/sneakers-tennis-shoes-basse_cod44727038aq.html">
+					<img alt="Sneakers &amp; Tennis shoes basse" data-src="../img/44727038AQ_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/mocassini_cod44704882bq.html"><img alt="Mocassini" data-src="../img/44704882BQ_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/mocassini_cod44704882bq.html">
+					<img alt="Mocassini" data-src="../img/44704882BQ_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 			<li>
-				<a href="#/it/donna/mocassini_cod44734002vc.html"><img alt="Mocassini" data-src="../img/44734002VC_15_a.jpg" width="220" height="280"></a>
+				<a href="#/it/donna/mocassini_cod44734002vc.html">
+					<img alt="Mocassini" data-src="../img/44734002VC_15_a.jpg" width="220" height="280">
+				</a>
 			</li>
 		</ul>
 	</div>
 	<button type="button" id="loadAll">
 		LOAD ALL
 	</button>
-	<script src="../dist/lazyload.js"></script>
+	<script src="../dist/lazyload.min.js"></script>
 	<script>
 		(function () {
 			function logElementEvent(eventName, element) {
 				console.log(new Date().getTime(), eventName, element.getAttribute('data-src'));
 			}
-					
+
 			ll = new LazyLoad({
 				callback_load: function (element) {
 					logElementEvent("LOADED", element);
@@ -188,9 +269,9 @@
 					logElementEvent("SET", element);
 				}
 			});
-			
+
 			var loadAllButton = document.getElementById('loadAll');
-			
+
 			loadAllButton.addEventListener('click', () => {
 				ll.loadAll();
 				loadAllButton.disabled = true;
@@ -199,4 +280,4 @@
 	</script>
 </body>
 
-</html>
+</html>
\ No newline at end of file
diff --git a/demos/video.html b/demos/video.html
index 6d8307f7..bd5de9eb 100644
--- a/demos/video.html
+++ b/demos/video.html
@@ -51,18 +51,14 @@
 		<p>Scroll down</p>
 		<p>Scroll down</p>
 		<p>Scroll down</p>
-		<video class="lazy" controls width="620"
-			data-src="https://archive.org/download/BigBuckBunny_124/Content/big_buck_bunny_720p_surround.mp4"
-			poster="https://peach.blender.org/wp-content/uploads/title_anouncement.jpg?x11217">
-			<source type="video/mp4"
-				data-src="https://archive.org/download/ElephantsDream/ed_1024_512kb.mp4">
-			<source type="video/ogg"
-				data-src="https://archive.org/download/ElephantsDream/ed_hd.ogv">
-			<source type="video/avi"
-				data-src="https://archive.org/download/ElephantsDream/ed_hd.avi">
+		<video class="lazy" controls width="620" data-src="https://archive.org/download/BigBuckBunny_124/Content/big_buck_bunny_720p_surround.mp4"
+		 poster="https://peach.blender.org/wp-content/uploads/title_anouncement.jpg?x11217">
+			<source type="video/mp4" data-src="https://archive.org/download/ElephantsDream/ed_1024_512kb.mp4">
+			<source type="video/ogg" data-src="https://archive.org/download/ElephantsDream/ed_hd.ogv">
+			<source type="video/avi" data-src="https://archive.org/download/ElephantsDream/ed_hd.avi">
 		</video>
 	</div>
-	<script src="../dist/lazyload.js"></script>
+	<script src="../dist/lazyload.min.js"></script>
 	<script>
 		new LazyLoad({
 			elements_selector: ".lazy"
@@ -70,4 +66,4 @@
 	</script>
 </body>
 
-</html>
+</html>
\ No newline at end of file

From a742d7258f113a1a6c4d2ab186422e45b91945f3 Mon Sep 17 00:00:00 2001
From: Andrea Verlicchi <verlicchia@yoox.net>
Date: Tue, 31 Jul 2018 09:11:12 +0200
Subject: [PATCH 02/12] Shortened crawler detection regex

---
 src/lazyload.environment.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lazyload.environment.js b/src/lazyload.environment.js
index 98d14c7e..ce76389b 100644
--- a/src/lazyload.environment.js
+++ b/src/lazyload.environment.js
@@ -2,7 +2,7 @@ export const runningOnBrowser = typeof window !== "undefined";
 
 export const isBot =
 	(runningOnBrowser && !("onscroll" in window)) ||
-	/glebot|bingbot|crawler|spider|robot|crawling/i.test(navigator.userAgent);
+	/(gle|ing|ro)bot|crawl|spider/i.test(navigator.userAgent);
 
 export const supportsIntersectionObserver =
 	runningOnBrowser && "IntersectionObserver" in window;

From 2d9c0a53d516455c41540ad67bafef7d4e5f3c85 Mon Sep 17 00:00:00 2001
From: Andrea Verlicchi <verlicchia@yoox.net>
Date: Fri, 3 Aug 2018 11:21:50 +0200
Subject: [PATCH 03/12] Created separated tasks for each output formats

---
 gulpfile.js       |   97 +-
 package-lock.json | 2671 +++++++++++++++++++++++++--------------------
 package.json      |    5 +-
 3 files changed, 1566 insertions(+), 1207 deletions(-)

diff --git a/gulpfile.js b/gulpfile.js
index 11dbb28a..93af2ded 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -1,13 +1,14 @@
 var gulp = require("gulp");
 var eslint = require("gulp-eslint");
 var rollup = require("gulp-rollup");
+var sourcemaps = require("gulp-sourcemaps");
 var rename = require("gulp-rename");
 var babel = require("gulp-babel");
 var uglify = require("gulp-uglify");
 
 var destFolder = "./dist";
 
-gulp.task("default", function() {
+gulp.task("lint", function() {
 	process.env.NODE_ENV = "release";
 	return (
 		gulp.
@@ -15,7 +16,83 @@ gulp.task("default", function() {
 			// ----------- linting --------------
 			pipe(eslint()).
 			pipe(eslint.format()).
-			pipe(eslint.failAfterError()). // --> failing if errors
+			pipe(eslint.failAfterError()) // --> failing if errors
+	);
+});
+
+gulp.task("dist-es", function() {
+	process.env.NODE_ENV = "release";
+	return (
+		gulp.
+			src("./src/**/*.js").
+			// ----------- rolling up --------------
+			pipe(
+				rollup({
+					output: { name: "LazyLoad", format: "es" },
+					input: "./src/lazyload.js"
+				})
+			).
+			pipe(rename("lazyload-es.js")).
+			pipe(gulp.dest(destFolder)) // --> writing rolledup
+	);
+});
+
+gulp.task("dist-cjs", function() {
+	process.env.NODE_ENV = "release";
+	return (
+		gulp.
+			src("./src/**/*.js").
+			pipe(sourcemaps.init()).
+			// ----------- rolling up --------------
+			pipe(
+				rollup({
+					output: { name: "LazyLoad", format: "cjs" },
+					input: "./src/lazyload.js"
+				})
+			).
+			// ----------- babelizing --------------
+			pipe(babel()).
+			pipe(rename("lazyload-cjs.js")).
+			pipe(gulp.dest(destFolder)). // --> writing babelized ES5
+			// ----------- minifying --------------
+			pipe(uglify()).
+			pipe(rename("lazyload-cjs.min.js")).
+			pipe(sourcemaps.write("")). // --> writing sourcemap
+			pipe(gulp.dest(destFolder)) // --> writing uglified
+	);
+});
+
+gulp.task("dist-amd", function() {
+	process.env.NODE_ENV = "release";
+	return (
+		gulp.
+			src("./src/**/*.js").
+			pipe(sourcemaps.init()).
+			// ----------- rolling up --------------
+			pipe(
+				rollup({
+					output: { name: "LazyLoad", format: "amd" },
+					input: "./src/lazyload.js"
+				})
+			).
+			// ----------- babelizing --------------
+			pipe(babel()).
+			pipe(rename("lazyload-amd.js")).
+			pipe(gulp.dest(destFolder)). // --> writing babelized ES5
+			// ----------- minifying --------------
+			pipe(uglify()).
+			pipe(rename("lazyload-amd.min.js")).
+			pipe(sourcemaps.write("")). // --> writing sourcemap
+			pipe(gulp.dest(destFolder)) // --> writing uglified
+	);
+});
+
+gulp.task("dist-umd", function() {
+	process.env.NODE_ENV = "release";
+	return (
+		gulp.
+			src("./src/**/*.js").
+			pipe(sourcemaps.init()).
 			// ----------- rolling up --------------
 			pipe(
 				rollup({
@@ -23,20 +100,24 @@ gulp.task("default", function() {
 					input: "./src/lazyload.js"
 				})
 			).
-			pipe(rename("lazyload.es2015.js")).
-			pipe(gulp.dest(destFolder)). // --> writing rolledup
 			// ----------- babelizing --------------
 			pipe(babel()).
-			pipe(rename("lazyload.js")).
+			pipe(rename("lazyload-umd.js")).
 			pipe(gulp.dest(destFolder)). // --> writing babelized ES5
 			// ----------- minifying --------------
 			pipe(uglify()).
-			pipe(rename("lazyload.min.js")).
+			pipe(rename("lazyload-umd.min.js")).
+			pipe(sourcemaps.write("")). // --> writing sourcemap
 			pipe(gulp.dest(destFolder)) // --> writing uglified
 	);
 });
 
 gulp.task("watch", function() {
-	gulp.watch("./src/**/*.js", ["default"]);
-	// Other watchers
+	gulp.watch("./src/**/*.js", [
+		"lint",
+		"dist-es",
+		"dist-cjs",
+		"dist-amd",
+		"dist-umd"
+	]);
 });
diff --git a/package-lock.json b/package-lock.json
index a6851c4b..95d427f8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,9 +1,40 @@
 {
   "name": "vanilla-lazyload",
-  "version": "10.0.1",
+  "version": "10.12.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "@gulp-sourcemaps/identity-map": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/@gulp-sourcemaps/identity-map/-/identity-map-1.0.2.tgz",
+      "integrity": "sha512-ciiioYMLdo16ShmfHBXJBOFm3xPC4AuwO4xeRpFeHz7WK9PYsWCmigagG2XyzZpubK4a3qNKoUBDhbzHfa50LQ==",
+      "dev": true,
+      "requires": {
+        "acorn": "^5.0.3",
+        "css": "^2.2.1",
+        "normalize-path": "^2.1.1",
+        "source-map": "^0.6.0",
+        "through2": "^2.0.3"
+      },
+      "dependencies": {
+        "source-map": {
+          "version": "0.6.1",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+          "dev": true
+        }
+      }
+    },
+    "@gulp-sourcemaps/map-sources": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@gulp-sourcemaps/map-sources/-/map-sources-1.0.0.tgz",
+      "integrity": "sha1-iQrnxdjId/bThIYCFazp1+yUW9o=",
+      "dev": true,
+      "requires": {
+        "normalize-path": "^2.0.1",
+        "through2": "^2.0.3"
+      }
+    },
     "abab": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/abab/-/abab-1.0.3.tgz",
@@ -22,7 +53,7 @@
       "integrity": "sha1-/YJw9x+7SZawBPqIDuXUZXOnMb8=",
       "dev": true,
       "requires": {
-        "acorn": "4.0.13"
+        "acorn": "^4.0.4"
       },
       "dependencies": {
         "acorn": {
@@ -39,7 +70,7 @@
       "integrity": "sha1-r9+UiPsezvyDSPb7IvRk4ypYs2s=",
       "dev": true,
       "requires": {
-        "acorn": "3.3.0"
+        "acorn": "^3.0.4"
       },
       "dependencies": {
         "acorn": {
@@ -56,10 +87,10 @@
       "integrity": "sha1-R8aNaehvXZUxA7AHSpQw3GPaXjk=",
       "dev": true,
       "requires": {
-        "co": "4.6.0",
-        "fast-deep-equal": "1.0.0",
-        "json-schema-traverse": "0.3.1",
-        "json-stable-stringify": "1.0.1"
+        "co": "^4.6.0",
+        "fast-deep-equal": "^1.0.0",
+        "json-schema-traverse": "^0.3.0",
+        "json-stable-stringify": "^1.0.1"
       }
     },
     "ajv-keywords": {
@@ -74,9 +105,9 @@
       "integrity": "sha1-DNkKVhCT810KmSVsIrcGlDP60Rc=",
       "dev": true,
       "requires": {
-        "kind-of": "3.2.2",
-        "longest": "1.0.1",
-        "repeat-string": "1.6.1"
+        "kind-of": "^3.0.2",
+        "longest": "^1.0.1",
+        "repeat-string": "^1.5.2"
       }
     },
     "amdefine": {
@@ -85,6 +116,15 @@
       "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
       "dev": true
     },
+    "ansi-colors": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-1.1.0.tgz",
+      "integrity": "sha1-Y3S03V1HGP884npnGjscrQdxMqk=",
+      "dev": true,
+      "requires": {
+        "ansi-wrap": "^0.1.0"
+      }
+    },
     "ansi-escapes": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-2.0.0.tgz",
@@ -103,14 +143,20 @@
       "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
       "dev": true
     },
+    "ansi-wrap": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/ansi-wrap/-/ansi-wrap-0.1.0.tgz",
+      "integrity": "sha1-qCJQ3bABXponyoLoLqYDu/pF768=",
+      "dev": true
+    },
     "anymatch": {
       "version": "1.3.2",
       "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-1.3.2.tgz",
-      "integrity": "sha512-0XNayC8lTHQ2OI8aljNCN3sSx6hsr/1+rlcDAotXJR7C1oZZHCNsfpbKwMjRA3Uqb5tF1Rae2oloTr4xpq+WjA==",
+      "integrity": "sha1-VT3Lj5HjyImEXf26NMd3IbkLnXo=",
       "dev": true,
       "requires": {
-        "micromatch": "2.3.11",
-        "normalize-path": "2.1.1"
+        "micromatch": "^2.1.5",
+        "normalize-path": "^2.0.0"
       }
     },
     "append-transform": {
@@ -119,7 +165,7 @@
       "integrity": "sha1-126/jKlNJ24keja61EpLdKthGZE=",
       "dev": true,
       "requires": {
-        "default-require-extensions": "1.0.0"
+        "default-require-extensions": "^1.0.0"
       }
     },
     "archy": {
@@ -134,7 +180,7 @@
       "integrity": "sha1-c9g7wmP4bpf4zE9rrhsOkKfSLIY=",
       "dev": true,
       "requires": {
-        "sprintf-js": "1.0.3"
+        "sprintf-js": "~1.0.2"
       }
     },
     "arr-diff": {
@@ -143,13 +189,19 @@
       "integrity": "sha1-jzuCf5Vai9ZpaX5KQlasPOrjVs8=",
       "dev": true,
       "requires": {
-        "arr-flatten": "1.1.0"
+        "arr-flatten": "^1.0.1"
       }
     },
     "arr-flatten": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/arr-flatten/-/arr-flatten-1.1.0.tgz",
-      "integrity": "sha512-L3hKV5R/p5o81R7O02IGnwpDmkp6E982XhtbuwSe3O4qOtMMMtodicASA1Cny2U+aCXcNpml+m4dPsvsJ3jatg==",
+      "integrity": "sha1-NgSLv/TntH4TZkQxbJlmnqWukfE=",
+      "dev": true
+    },
+    "arr-union": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/arr-union/-/arr-union-3.1.0.tgz",
+      "integrity": "sha1-45sJrqne+Gao8gbiiK9jkZuuOcQ=",
       "dev": true
     },
     "array-differ": {
@@ -182,7 +234,7 @@
       "integrity": "sha1-mjRBDk9OPaI96jdb5b5w8kd47Dk=",
       "dev": true,
       "requires": {
-        "array-uniq": "1.0.3"
+        "array-uniq": "^1.0.1"
       }
     },
     "array-uniq": {
@@ -215,13 +267,19 @@
       "integrity": "sha1-104bh+ev/A24qttwIfP+SBAasjQ=",
       "dev": true
     },
+    "assign-symbols": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/assign-symbols/-/assign-symbols-1.0.0.tgz",
+      "integrity": "sha1-WWZ/QfrdTyDMvCu5a41Pf3jsA2c=",
+      "dev": true
+    },
     "async": {
       "version": "2.5.0",
       "resolved": "https://registry.npmjs.org/async/-/async-2.5.0.tgz",
       "integrity": "sha512-e+lJAJeNWuPCNyxZKOBdaJGyLGHugXVQtrAwtuAe2vhxTYxFTKE73p8JuTmdH0qdQZtDvI4dhJwjZc5zsfIsYw==",
       "dev": true,
       "requires": {
-        "lodash": "4.17.4"
+        "lodash": "^4.14.0"
       }
     },
     "asynckit": {
@@ -230,6 +288,12 @@
       "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k=",
       "dev": true
     },
+    "atob": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/atob/-/atob-2.1.1.tgz",
+      "integrity": "sha1-ri1acpR38onWDdf5amMUoi3Wwio=",
+      "dev": true
+    },
     "aws-sign2": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.6.0.tgz",
@@ -248,9 +312,9 @@
       "integrity": "sha1-Y/1D99weO7fONZR9uP42mj9Yx0s=",
       "dev": true,
       "requires": {
-        "chalk": "1.1.3",
-        "esutils": "2.0.2",
-        "js-tokens": "3.0.2"
+        "chalk": "^1.1.3",
+        "esutils": "^2.0.2",
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@@ -3168,7 +3436,7 @@
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@@ -3208,8 +3476,8 @@
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-        "once": "1.4.0",
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@@ -3249,7 +3517,7 @@
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@@ -3260,8 +3528,8 @@
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@@ -3270,10 +3538,10 @@
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@@ -3282,9 +3550,9 @@
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@@ -3305,9 +3573,9 @@
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-        "resolve": "1.4.0"
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@@ -3316,7 +3584,7 @@
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@@ -3325,21 +3593,21 @@
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@@ -3356,12 +3624,12 @@
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-        "pretty-format": "20.0.3"
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@@ -3370,13 +3638,13 @@
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-        "leven": "2.1.0",
-        "mkdirp": "0.5.1"
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@@ -3385,10 +3653,10 @@
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-        "leven": "2.1.0",
-        "pretty-format": "20.0.3"
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@@ -3403,8 +3671,8 @@
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-        "esprima": "4.0.0"
+        "argparse": "^1.0.7",
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@@ -3426,25 +3694,25 @@
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@@ -3526,7 +3794,7 @@
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-        "type-check": "0.3.2"
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-        "path-exists": "3.0.0"
+        "p-locate": "^2.0.0",
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-        "lodash.isarguments": "3.1.0",
-        "lodash.isarray": "3.0.4"
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-        "lodash.templatesettings": "3.1.1"
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-        "lodash._reinterpolate": "3.0.0",
-        "lodash.escape": "3.2.0"
+        "lodash._reinterpolate": "^3.0.0",
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       "dev": true
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+      "resolved": "https://registry.npmjs.org/lru-queue/-/lru-queue-0.1.0.tgz",
+      "integrity": "sha1-Jzi9nw089PhEkMVzbEhpmsYyzaM=",
+      "dev": true,
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+      "resolved": "https://registry.npmjs.org/memoizee/-/memoizee-0.4.12.tgz",
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       "dev": true,
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@@ -3925,6 +4212,12 @@
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       "dev": true
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+      "resolved": "https://registry.npmjs.org/next-tick/-/next-tick-1.0.0.tgz",
+      "integrity": "sha1-yobR/ogoFpsBICCOPchCS524NCw=",
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-        "shellwords": "0.1.1",
-        "which": "1.3.0"
+        "growly": "^1.3.0",
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+      "integrity": "sha1-EvlaMH1YNSB1oEkHuErIvpisAS8=",
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-        "semver": "5.4.1",
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@@ -3961,17 +4254,7 @@
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-      "dev": true,
-      "requires": {
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-        "white-space-x": "2.0.2"
+        "remove-trailing-separator": "^1.0.1"
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-        "for-own": "1.0.0",
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+        "array-each": "^1.0.1",
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@@ -4016,7 +4299,7 @@
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           "dev": true,
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@@ -4033,8 +4316,8 @@
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-        "is-extendable": "0.1.1"
+        "for-own": "^0.1.4",
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@@ -4060,7 +4343,7 @@
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       "dev": true,
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+        "wrappy": "1"
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@@ -4069,7 +4352,7 @@
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       "dev": true,
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-        "mimic-fn": "1.1.0"
+        "mimic-fn": "^1.0.0"
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@@ -4078,8 +4361,8 @@
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-        "wordwrap": "0.0.3"
+        "minimist": "~0.0.1",
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@@ -4102,12 +4385,12 @@
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-        "type-check": "0.3.2",
-        "wordwrap": "1.0.0"
+        "deep-is": "~0.1.3",
+        "fast-levenshtein": "~2.0.4",
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+        "prelude-ls": "~1.1.2",
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-        "sequencify": "0.0.7",
-        "stream-consume": "0.1.0"
+        "end-of-stream": "~0.1.5",
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@@ -4139,7 +4422,7 @@
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       "dev": true,
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@@ -4160,7 +4443,7 @@
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       "dev": true,
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@@ -4175,9 +4458,9 @@
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-        "map-cache": "0.2.2",
-        "path-root": "0.1.1"
+        "is-absolute": "^0.2.3",
+        "map-cache": "^0.2.0",
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@@ -4186,10 +4469,10 @@
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-        "is-dotfile": "1.0.3",
-        "is-extglob": "1.0.0",
-        "is-glob": "2.0.1"
+        "glob-base": "^0.3.0",
+        "is-dotfile": "^1.0.0",
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@@ -4198,7 +4481,7 @@
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       "dev": true,
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       "dev": true,
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+        "path-root-regex": "^0.1.0"
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@@ -4258,9 +4541,9 @@
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-        "pify": "2.3.0",
-        "pinkie-promise": "2.0.1"
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     "whatwg-encoding": {
@@ -5513,8 +5796,8 @@
       "integrity": "sha1-0pgaqRSMHgCkHFphMRZqtGg7vMA=",
       "dev": true,
       "requires": {
-        "tr46": "0.0.3",
-        "webidl-conversions": "3.0.1"
+        "tr46": "~0.0.3",
+        "webidl-conversions": "^3.0.0"
       },
       "dependencies": {
         "webidl-conversions": {
@@ -5528,10 +5811,10 @@
     "which": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/which/-/which-1.3.0.tgz",
-      "integrity": "sha512-xcJpopdamTuY5duC/KnTTNBraPK54YwpenP4lzxU8H91GudWpFv38u0CKjclE1Wi2EH2EDz5LRcHcKbCIzqGyg==",
+      "integrity": "sha1-/wS9/AEO5UfXgL7DjhrBwnd9JTo=",
       "dev": true,
       "requires": {
-        "isexe": "2.0.0"
+        "isexe": "^2.0.0"
       }
     },
     "which-module": {
@@ -5540,12 +5823,6 @@
       "integrity": "sha1-u6Y8qGGUiZT/MHc2CJ47lgJsKk8=",
       "dev": true
     },
-    "white-space-x": {
-      "version": "2.0.2",
-      "resolved": "https://registry.npmjs.org/white-space-x/-/white-space-x-2.0.2.tgz",
-      "integrity": "sha512-fFV+/CTimN5y1ivUbnnH1yL/D8WiXqK9IixeLlxXWMttTJWY6g40v7o+i0Q6wFH0eQ/IPo8fBH2CaquIwEDkxw==",
-      "dev": true
-    },
     "window-size": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/window-size/-/window-size-0.1.0.tgz",
@@ -5565,8 +5842,8 @@
       "integrity": "sha512-DHRiUggxtbruaTwnLDm2/BRDKZIoOYvrgYUj5Bam4fU6Gtvc0FaEyoswFPBjMXAweGW2H4BDNIpy//1yXXuaqQ==",
       "dev": true,
       "requires": {
-        "errno": "0.1.4",
-        "xtend": "4.0.1"
+        "errno": "^0.1.4",
+        "xtend": "^4.0.1"
       }
     },
     "wrap-ansi": {
@@ -5575,8 +5852,8 @@
       "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
       "dev": true,
       "requires": {
-        "string-width": "1.0.2",
-        "strip-ansi": "3.0.1"
+        "string-width": "^1.0.1",
+        "strip-ansi": "^3.0.1"
       },
       "dependencies": {
         "is-fullwidth-code-point": {
@@ -5585,7 +5862,7 @@
           "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
           "dev": true,
           "requires": {
-            "number-is-nan": "1.0.1"
+            "number-is-nan": "^1.0.0"
           }
         },
         "string-width": {
@@ -5594,9 +5871,9 @@
           "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
           "dev": true,
           "requires": {
-            "code-point-at": "1.1.0",
-            "is-fullwidth-code-point": "1.0.0",
-            "strip-ansi": "3.0.1"
+            "code-point-at": "^1.0.0",
+            "is-fullwidth-code-point": "^1.0.0",
+            "strip-ansi": "^3.0.0"
           }
         }
       }
@@ -5613,7 +5890,7 @@
       "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
       "dev": true,
       "requires": {
-        "mkdirp": "0.5.1"
+        "mkdirp": "^0.5.1"
       }
     },
     "xml-name-validator": {
@@ -5646,19 +5923,19 @@
       "integrity": "sha1-a6MY6xaWFyf10oT46gA+jWFU0Mg=",
       "dev": true,
       "requires": {
-        "camelcase": "3.0.0",
-        "cliui": "3.2.0",
-        "decamelize": "1.2.0",
-        "get-caller-file": "1.0.2",
-        "os-locale": "1.4.0",
-        "read-pkg-up": "1.0.1",
-        "require-directory": "2.1.1",
-        "require-main-filename": "1.0.1",
-        "set-blocking": "2.0.0",
-        "string-width": "1.0.2",
-        "which-module": "1.0.0",
-        "y18n": "3.2.1",
-        "yargs-parser": "5.0.0"
+        "camelcase": "^3.0.0",
+        "cliui": "^3.2.0",
+        "decamelize": "^1.1.1",
+        "get-caller-file": "^1.0.1",
+        "os-locale": "^1.4.0",
+        "read-pkg-up": "^1.0.1",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^1.0.1",
+        "set-blocking": "^2.0.0",
+        "string-width": "^1.0.2",
+        "which-module": "^1.0.0",
+        "y18n": "^3.2.1",
+        "yargs-parser": "^5.0.0"
       },
       "dependencies": {
         "camelcase": {
@@ -5673,9 +5950,9 @@
           "integrity": "sha1-EgYBU3qRbSmUD5NNo7SNWFo5IT0=",
           "dev": true,
           "requires": {
-            "string-width": "1.0.2",
-            "strip-ansi": "3.0.1",
-            "wrap-ansi": "2.1.0"
+            "string-width": "^1.0.1",
+            "strip-ansi": "^3.0.1",
+            "wrap-ansi": "^2.0.0"
           }
         },
         "is-fullwidth-code-point": {
@@ -5684,7 +5961,7 @@
           "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
           "dev": true,
           "requires": {
-            "number-is-nan": "1.0.1"
+            "number-is-nan": "^1.0.0"
           }
         },
         "string-width": {
@@ -5693,9 +5970,9 @@
           "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
           "dev": true,
           "requires": {
-            "code-point-at": "1.1.0",
-            "is-fullwidth-code-point": "1.0.0",
-            "strip-ansi": "3.0.1"
+            "code-point-at": "^1.0.0",
+            "is-fullwidth-code-point": "^1.0.0",
+            "strip-ansi": "^3.0.0"
           }
         }
       }
@@ -5706,7 +5983,7 @@
       "integrity": "sha1-J17PDX/+Bcd+ZOfIbkzZS/DhIoo=",
       "dev": true,
       "requires": {
-        "camelcase": "3.0.0"
+        "camelcase": "^3.0.0"
       },
       "dependencies": {
         "camelcase": {
diff --git a/package.json b/package.json
index 87e8a38e..be217705 100644
--- a/package.json
+++ b/package.json
@@ -8,10 +8,11 @@
 		"babel-plugin-transform-object-assign": "^6.22.0",
 		"babel-preset-es2015": "^6.24.1",
 		"gulp": "^3.9.1",
-		"gulp-babel": "^7.0.0",
+		"gulp-babel": "^7.0.1",
 		"gulp-eslint": "^4.0.0",
 		"gulp-rename": "^1.2.2",
-		"gulp-rollup": "^2.14.0",
+		"gulp-rollup": "^2.16.2",
+		"gulp-sourcemaps": "^2.6.4",
 		"gulp-uglify": "^3.0.0",
 		"jest-cli": "^20.0.4"
 	},

From ebf6c0fbed873f85cbe9e59ff3acb9de7f368ab8 Mon Sep 17 00:00:00 2001
From: Andrea Verlicchi <verlicchia@yoox.net>
Date: Fri, 3 Aug 2018 11:24:45 +0200
Subject: [PATCH 04/12] Added IIFE output format, UMD made default

---
 gulpfile.js | 29 +++++++++++++++++++++++++++--
 1 file changed, 27 insertions(+), 2 deletions(-)

diff --git a/gulpfile.js b/gulpfile.js
index 93af2ded..88c1f134 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -102,11 +102,36 @@ gulp.task("dist-umd", function() {
 			).
 			// ----------- babelizing --------------
 			pipe(babel()).
-			pipe(rename("lazyload-umd.js")).
+			pipe(rename("lazyload.js")).
 			pipe(gulp.dest(destFolder)). // --> writing babelized ES5
 			// ----------- minifying --------------
 			pipe(uglify()).
-			pipe(rename("lazyload-umd.min.js")).
+			pipe(rename("lazyload.min.js")).
+			pipe(sourcemaps.write("")). // --> writing sourcemap
+			pipe(gulp.dest(destFolder)) // --> writing uglified
+	);
+});
+
+gulp.task("dist-iife", function() {
+	process.env.NODE_ENV = "release";
+	return (
+		gulp.
+			src("./src/**/*.js").
+			pipe(sourcemaps.init()).
+			// ----------- rolling up --------------
+			pipe(
+				rollup({
+					output: { name: "LazyLoad", format: "iife" },
+					input: "./src/lazyload.js"
+				})
+			).
+			// ----------- babelizing --------------
+			pipe(babel()).
+			pipe(rename("lazyload-iife.js")).
+			pipe(gulp.dest(destFolder)). // --> writing babelized ES5
+			// ----------- minifying --------------
+			pipe(uglify()).
+			pipe(rename("lazyload-iife.min.js")).
 			pipe(sourcemaps.write("")). // --> writing sourcemap
 			pipe(gulp.dest(destFolder)) // --> writing uglified
 	);

From 2541f31542160715ba80ae3b91ee3ce547cd7b53 Mon Sep 17 00:00:00 2001
From: Andrea Verlicchi <verlicchia@yoox.net>
Date: Fri, 3 Aug 2018 11:25:22 +0200
Subject: [PATCH 05/12] Added dist-iife to watch task

---
 gulpfile.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gulpfile.js b/gulpfile.js
index 88c1f134..6cc33fcb 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -140,9 +140,10 @@ gulp.task("dist-iife", function() {
 gulp.task("watch", function() {
 	gulp.watch("./src/**/*.js", [
 		"lint",
+		"dist-umd",
 		"dist-es",
 		"dist-cjs",
 		"dist-amd",
-		"dist-umd"
+		"dist-iife"
 	]);
 });

From ebd6c3517b2e3d352db0bc80333b456874915f48 Mon Sep 17 00:00:00 2001
From: Andrea Verlicchi <verlicchia@yoox.net>
Date: Fri, 3 Aug 2018 11:29:05 +0200
Subject: [PATCH 06/12] Created gulp default task

---
 gulpfile.js | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/gulpfile.js b/gulpfile.js
index 6cc33fcb..5652d0a9 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -147,3 +147,12 @@ gulp.task("watch", function() {
 		"dist-iife"
 	]);
 });
+
+gulp.task("default", [
+	"lint",
+	"dist-umd",
+	"dist-es",
+	"dist-cjs",
+	"dist-amd",
+	"dist-iife"
+]);

From 195206d4e99ae1d8077271749393005f8c4cdfa8 Mon Sep 17 00:00:00 2001
From: Andrea Verlicchi <andrea.verlicchi@gmail.com>
Date: Fri, 3 Aug 2018 23:44:29 +0200
Subject: [PATCH 07/12] Extension change to webp - first commit

---
 src/lazyload.defaults.js    | 37 +++++++++++++++++-----------------
 src/lazyload.environment.js |  2 ++
 src/lazyload.setSources.js  | 40 +++++++++++++++++++++++++++----------
 3 files changed, 51 insertions(+), 28 deletions(-)

diff --git a/src/lazyload.defaults.js b/src/lazyload.defaults.js
index 99989d4d..522dc627 100644
--- a/src/lazyload.defaults.js
+++ b/src/lazyload.defaults.js
@@ -1,19 +1,20 @@
-export default (customSettings) => {
-    const defaultSettings = {
-        elements_selector: "img",
-        container: document,
-        threshold: 300,
-        data_src: "src",
-        data_srcset: "srcset",
-        data_sizes: "sizes",
-        class_loading: "loading",
-        class_loaded: "loaded",
-        class_error: "error",
-        callback_load: null,
-        callback_error: null,
-        callback_set: null,
-        callback_enter: null
-    };
+export default customSettings => {
+	const defaultSettings = {
+		elements_selector: "img",
+		container: document,
+		threshold: 300,
+		data_src: "src",
+		data_srcset: "srcset",
+		data_sizes: "sizes",
+		class_loading: "loading",
+		class_loaded: "loaded",
+		class_error: "error",
+		callback_load: null,
+		callback_error: null,
+		callback_set: null,
+		callback_enter: null,
+		ext_to_webp: false
+	};
 
-    return Object.assign({}, defaultSettings, customSettings);
-};
\ No newline at end of file
+	return Object.assign({}, defaultSettings, customSettings);
+};
diff --git a/src/lazyload.environment.js b/src/lazyload.environment.js
index ce76389b..f1d2202f 100644
--- a/src/lazyload.environment.js
+++ b/src/lazyload.environment.js
@@ -9,3 +9,5 @@ export const supportsIntersectionObserver =
 
 export const supportsClassList =
 	runningOnBrowser && "classList" in document.createElement("p");
+
+export const supportsWebP = runningOnBrowser && false; // && TODO
diff --git a/src/lazyload.setSources.js b/src/lazyload.setSources.js
index bf048acf..7cee4db9 100644
--- a/src/lazyload.setSources.js
+++ b/src/lazyload.setSources.js
@@ -1,25 +1,33 @@
 import { getData } from "./lazyload.data";
+import { supportsWebP } from "./lazyload.environment";
 
 export const setSourcesInChildren = function(
 	parentTag,
 	attrName,
-	dataAttrName
+	dataAttrName,
+	toWebP
 ) {
 	for (let i = 0, childTag; (childTag = parentTag.children[i]); i += 1) {
 		if (childTag.tagName === "SOURCE") {
-			let attributeValue = getData(childTag, dataAttrName);
-			if (attributeValue) {
-				childTag.setAttribute(attrName, attributeValue);
-			}
+			let attrValue = getData(childTag, dataAttrName);
+			setAttributeIfNotNullOrEmpty(childTag, attrName, attrValue, toWebP);
 		}
 	}
 };
 
-export const setAttributeIfNotNullOrEmpty = function(element, attrName, value) {
+const replaceExtToWebp = (value, condition) =>
+	condition ? value.replace(/\.(jpe?g|png)/gi, ".webp") : value;
+
+export const setAttributeIfNotNullOrEmpty = function(
+	element,
+	attrName,
+	value,
+	toWebP
+) {
 	if (!value) {
 		return;
 	}
-	element.setAttribute(attrName, value);
+	element.setAttribute(attrName, replaceExtToWebp(value, toWebP));
 };
 
 export const setSources = function(element, settings) {
@@ -32,14 +40,25 @@ export const setSources = function(element, settings) {
 	switch (element.tagName) {
 		case "IMG": {
 			const parent = element.parentNode;
+			const mustChangeToWebP = supportsWebP && settings.ext_to_webp;
 			if (parent && parent.tagName === "PICTURE") {
 				setSourcesInChildren(parent, "srcset", srcsetDataName);
 			}
 			const sizesDataValue = getData(element, sizesDataName);
 			setAttributeIfNotNullOrEmpty(element, "sizes", sizesDataValue);
 			const srcsetDataValue = getData(element, srcsetDataName);
-			setAttributeIfNotNullOrEmpty(element, "srcset", srcsetDataValue);
-			setAttributeIfNotNullOrEmpty(element, "src", srcDataValue);
+			setAttributeIfNotNullOrEmpty(
+				element,
+				"srcset",
+				srcsetDataValue,
+				mustChangeToWebP
+			);
+			setAttributeIfNotNullOrEmpty(
+				element,
+				"src",
+				srcDataValue,
+				mustChangeToWebP
+			);
 			break;
 		}
 		case "IFRAME":
@@ -51,7 +70,8 @@ export const setSources = function(element, settings) {
 			break;
 		default:
 			if (srcDataValue) {
-				element.style.backgroundImage = `url("${srcDataValue}")`;
+				let setValue = replaceExtToWebp(srcDataValue, mustChangeToWebP);
+				element.style.backgroundImage = `url("${setValue}")`;
 			}
 	}
 };

From 134677e71b7b10828f3abcff7d59e03cbd4122f4 Mon Sep 17 00:00:00 2001
From: Andrea Verlicchi <verlicchia@yoox.net>
Date: Mon, 6 Aug 2018 15:57:10 +0200
Subject: [PATCH 08/12] Settings: don't check var declaration before all

---
 .eslintrc.json | 160 ++++++++++++++++++++++++-------------------------
 1 file changed, 80 insertions(+), 80 deletions(-)

diff --git a/.eslintrc.json b/.eslintrc.json
index efd4786f..400f9475 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -1,81 +1,81 @@
 {
-    "parserOptions": {
-        "ecmaVersion": 6,
-        "sourceType": "module"
-    },
-    "env": {
-        "browser": true,
-        "jest": true
-    },
-    "rules": {
-        "quotes": [2, "double"],
-        "block-scoped-var": 1,
-        "class-methods-use-this": 1,
-        "complexity": 1,
-        "consistent-return": 1,
-        "curly": 2,
-        "default-case": 1,
-        "dot-location": 1,
-        "dot-notation": 1,
-        "eqeqeq": 2,
-        "guard-for-in": 1,
-        "no-alert": 1,
-        "no-caller": 1,
-        "no-case-declarations": 1,
-        "no-div-regex": 1,
-        "no-else-return": 1,
-        "no-empty-function": 1,
-        "no-empty-pattern": 1,
-        "no-eq-null": 1,
-        "no-eval": 1,
-        "no-extend-native": 1,
-        "no-extra-bind": 1,
-        "no-extra-label": 1,
-        "no-fallthrough": 1,
-        "no-floating-decimal": 1,
-        "no-global-assign": 1,
-        "no-implicit-coercion": 0,
-        "no-implicit-globals": 1,
-        "no-implied-eval": 1,
-        "no-invalid-this": 1,
-        "no-iterator": 1,
-        "no-labels": 1,
-        "no-lone-blocks": 1,
-        "no-loop-func": 1,
-        "no-magic-numbers": [1, {"ignore": [-1, 0, 1]}],
-        "no-multi-spaces": 1,
-        "no-multi-str": 1,
-        "no-new": 1,
-        "no-new-func": 1,
-        "no-new-wrappers": 1,
-        "no-octal": 1,
-        "no-octal-escape": 1,
-        "no-param-reassign": 1,
-        "no-proto": 1,
-        "no-redeclare": 1,
-        "no-restricted-properties": 1,
-        "no-return-assign": 1,
-        "no-return-await": 1,
-        "no-script-url": 1,
-        "no-self-assign": 1,
-        "no-self-compare": 1,
-        "no-sequences": 1,
-        "no-throw-literal": 1,
-        "no-unmodified-loop-condition": 1,
-        "no-unused-expressions": 1,
-        "no-unused-labels": 1,
-        "no-useless-call": 1,
-        "no-useless-concat": 1,
-        "no-useless-escape": 1,
-        "no-useless-return": 1,
-        "no-void": 1,
-        "no-warning-comments": 1,
-        "no-with": 1,
-        "prefer-promise-reject-errors": 1,
-        "radix": 1,
-        "require-await": 1,
-        "vars-on-top": 1,
-        "wrap-iife": 1,
-        "yoda": 1
-    }
-}
\ No newline at end of file
+	"parserOptions": {
+		"ecmaVersion": 6,
+		"sourceType": "module"
+	},
+	"env": {
+		"browser": true,
+		"jest": true
+	},
+	"rules": {
+		"quotes": [2, "double"],
+		"block-scoped-var": 1,
+		"class-methods-use-this": 1,
+		"complexity": 1,
+		"consistent-return": 1,
+		"curly": 2,
+		"default-case": 1,
+		"dot-location": 1,
+		"dot-notation": 1,
+		"eqeqeq": 2,
+		"guard-for-in": 1,
+		"no-alert": 1,
+		"no-caller": 1,
+		"no-case-declarations": 1,
+		"no-div-regex": 1,
+		"no-else-return": 1,
+		"no-empty-function": 1,
+		"no-empty-pattern": 1,
+		"no-eq-null": 1,
+		"no-eval": 1,
+		"no-extend-native": 1,
+		"no-extra-bind": 1,
+		"no-extra-label": 1,
+		"no-fallthrough": 1,
+		"no-floating-decimal": 1,
+		"no-global-assign": 1,
+		"no-implicit-coercion": 0,
+		"no-implicit-globals": 1,
+		"no-implied-eval": 1,
+		"no-invalid-this": 1,
+		"no-iterator": 1,
+		"no-labels": 1,
+		"no-lone-blocks": 1,
+		"no-loop-func": 1,
+		"no-magic-numbers": [1, { "ignore": [-1, 0, 1] }],
+		"no-multi-spaces": 1,
+		"no-multi-str": 1,
+		"no-new": 1,
+		"no-new-func": 1,
+		"no-new-wrappers": 1,
+		"no-octal": 1,
+		"no-octal-escape": 1,
+		"no-param-reassign": 1,
+		"no-proto": 1,
+		"no-redeclare": 1,
+		"no-restricted-properties": 1,
+		"no-return-assign": 1,
+		"no-return-await": 1,
+		"no-script-url": 1,
+		"no-self-assign": 1,
+		"no-self-compare": 1,
+		"no-sequences": 1,
+		"no-throw-literal": 1,
+		"no-unmodified-loop-condition": 1,
+		"no-unused-expressions": 1,
+		"no-unused-labels": 1,
+		"no-useless-call": 1,
+		"no-useless-concat": 1,
+		"no-useless-escape": 1,
+		"no-useless-return": 1,
+		"no-void": 1,
+		"no-warning-comments": 1,
+		"no-with": 1,
+		"prefer-promise-reject-errors": 1,
+		"radix": 1,
+		"require-await": 1,
+		"vars-on-top": 0,
+		"wrap-iife": 1,
+		"yoda": 1
+	}
+}

From 1c3a2bd8dcfeffeebb57c636557d7a7fadfa9f2d Mon Sep 17 00:00:00 2001
From: Andrea Verlicchi <verlicchia@yoox.net>
Date: Mon, 6 Aug 2018 15:57:23 +0200
Subject: [PATCH 09/12] Added 2 new demos for webP conversion

---
 demos/to_webp_all.html  | 324 +++++++++++++++++++++++++++++++++++++++
 demos/to_webp_some.html | 325 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 649 insertions(+)
 create mode 100644 demos/to_webp_all.html
 create mode 100644 demos/to_webp_some.html

diff --git a/demos/to_webp_all.html b/demos/to_webp_all.html
new file mode 100644
index 00000000..0b101e79
--- /dev/null
+++ b/demos/to_webp_all.html
@@ -0,0 +1,324 @@
+<!DOCTYPE html>
+<html>
+
+<head lang="en">
+	<meta charset="UTF-8">
+	<title>
+		Lazyload tests
+	</title>
+	<style>
+		ul,
+		li {
+			list-style-type: none;
+			margin: 0;
+			padding: 0;
+		}
+
+		a,
+		img {
+			display: block;
+		}
+
+		img {
+			border: 0;
+		}
+
+		img:not([src]) {
+			visibility: hidden;
+		}
+
+		/* Fixes Firefox anomaly during image load */
+
+		@-moz-document url-prefix() {
+			img:-moz-loading {
+				visibility: hidden;
+			}
+		}
+	</style>
+</head>
+
+<body>
+	<div id="results1" class="results">
+		<ul>
+			<li>
+				<a href="#">
+					<img alt="Stivaletti" src="https://placehold.it/220x280?text=01.jpg" srcset="https://placehold.it/220x280?text=01.jpg 1x, https://placehold.it/440x560?text=01.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<picture>
+						<source media="(min-width: 1px)" data-srcset="https://placehold.it/220x280?text=01_pic.jpg 1x, https://placehold.it/440x560?text=01_pic.jpg 2x">
+						<img class="lazy" alt="Stivaletti" data-src="https://placehold.it/220x280?text=01_pic.jpg" data-srcset="https://placehold.it/220x280?text=01_pic.jpg 1x, https://placehold.it/440x560?text=01.jpg 2x"
+						 width="220" height="280">
+					</picture>
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Open toe" data-src="https://placehold.it/220x280?text=02.jpg" data-srcset="https://placehold.it/220x280?text=02.jpg 1x, https://placehold.it/440x560?text=02.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Sneakers &amp; Tennis" data-src="https://placehold.it/220x280?text=03.jpg" data-srcset="https://placehold.it/220x280?text=03.jpg 1x, https://placehold.it/440x560?text=03.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Sneakers &amp; Tennis shoes basse" data-src="https://placehold.it/220x280?text=04.jpg" data-srcset="https://placehold.it/220x280?text=04.jpg 1x, https://placehold.it/440x560?text=04.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Sneakers &amp; Tennis shoes alte" data-src="https://placehold.it/220x280?text=05.jpg" data-srcset="https://placehold.it/220x280?text=05.jpg 1x, https://placehold.it/440x560?text=05.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Sneakers &amp; Tennis shoes alte" data-src="https://placehold.it/220x280?text=06.jpg" data-srcset="https://placehold.it/220x280?text=06.jpg 1x, https://placehold.it/440x560?text=06.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Sneakers &amp; Tennis shoes basse" data-src="https://placehold.it/220x280?text=07.jpg" data-srcset="https://placehold.it/220x280?text=07.jpg 1x, https://placehold.it/440x560?text=07.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Sneakers &amp; Tennis shoes basse" data-src="https://placehold.it/220x280?text=08.jpg" data-srcset="https://placehold.it/220x280?text=08.jpg 1x, https://placehold.it/440x560?text=08.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Stivali" data-src="https://placehold.it/220x280?text=09.jpg" data-srcset="https://placehold.it/220x280?text=09.jpg 1x, https://placehold.it/440x560?text=09.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Stivali" data-src="https://placehold.it/220x280?text=10.jpg" data-srcset="https://placehold.it/220x280?text=10.jpg 1x, https://placehold.it/440x560?text=10.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Stivaletti" data-src="https://placehold.it/220x280?text=11.jpg" data-srcset="https://placehold.it/220x280?text=11.jpg 1x, https://placehold.it/440x560?text=11.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Stivaletti" data-src="https://placehold.it/220x280?text=12.jpg" data-srcset="https://placehold.it/220x280?text=12.jpg 1x, https://placehold.it/440x560?text=12.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Stivali" data-src="https://placehold.it/220x280?text=13.jpg" data-srcset="https://placehold.it/220x280?text=13.jpg 1x, https://placehold.it/440x560?text=13.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Stivaletti" data-src="https://placehold.it/220x280?text=14.jpg" data-srcset="https://placehold.it/220x280?text=14.jpg 1x, https://placehold.it/440x560?text=14.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Décolleté" data-src="https://placehold.it/220x280?text=15.jpg" data-srcset="https://placehold.it/220x280?text=15.jpg 1x, https://placehold.it/440x560?text=15.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Mocassini" data-src="https://placehold.it/220x280?text=16.jpg" data-srcset="https://placehold.it/220x280?text=16.jpg 1x, https://placehold.it/440x560?text=16.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Stivaletti" data-src="https://placehold.it/220x280?text=17.jpg" data-srcset="https://placehold.it/220x280?text=17.jpg 1x, https://placehold.it/440x560?text=17.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Décolleté" data-src="https://placehold.it/220x280?text=18.jpg" data-srcset="https://placehold.it/220x280?text=18.jpg 1x, https://placehold.it/440x560?text=18.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Décolleté" data-src="https://placehold.it/220x280?text=19.jpg" data-srcset="https://placehold.it/220x280?text=19.jpg 1x, https://placehold.it/440x560?text=19.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Francesine" data-src="https://placehold.it/220x280?text=20.jpg" data-srcset="https://placehold.it/220x280?text=20.jpg 1x, https://placehold.it/440x560?text=20.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Stivaletti" data-src="https://placehold.it/220x280?text=21.jpg" data-srcset="https://placehold.it/220x280?text=21.jpg 1x, https://placehold.it/440x560?text=21.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Décolleté" data-src="https://placehold.it/220x280?text=22.jpg" data-srcset="https://placehold.it/220x280?text=22.jpg 1x, https://placehold.it/440x560?text=22.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Mocassini" data-src="https://placehold.it/220x280?text=23.jpg" data-srcset="https://placehold.it/220x280?text=23.jpg 1x, https://placehold.it/440x560?text=23.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Mocassini" data-src="https://placehold.it/220x280?text=24.jpg" data-srcset="https://placehold.it/220x280?text=24.jpg 1x, https://placehold.it/440x560?text=24.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Stivali" data-src="https://placehold.it/220x280?text=25.jpg" data-srcset="https://placehold.it/220x280?text=25.jpg 1x, https://placehold.it/440x560?text=25.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Stivaletti" data-src="https://placehold.it/220x280?text=26.jpg" data-srcset="https://placehold.it/220x280?text=26.jpg 1x, https://placehold.it/440x560?text=26.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Stivaletti" data-src="https://placehold.it/220x280?text=27.jpg" data-srcset="https://placehold.it/220x280?text=27.jpg 1x, https://placehold.it/440x560?text=27.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Mocassini" data-src="https://placehold.it/220x280?text=28.jpg" data-srcset="https://placehold.it/220x280?text=28.jpg 1x, https://placehold.it/440x560?text=28.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Stivaletti" data-src="https://placehold.it/220x280?text=29.jpg" data-srcset="https://placehold.it/220x280?text=29.jpg 1x, https://placehold.it/440x560?text=29.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Stivaletti" data-src="https://placehold.it/220x280?text=30.jpg" data-srcset="https://placehold.it/220x280?text=30.jpg 1x, https://placehold.it/440x560?text=30.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Stivaletti" data-src="https://placehold.it/220x280?text=31.jpg" data-srcset="https://placehold.it/220x280?text=31.jpg 1x, https://placehold.it/440x560?text=31.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Stivaletti" data-src="https://placehold.it/220x280?text=32.jpg" data-srcset="https://placehold.it/220x280?text=32.jpg 1x, https://placehold.it/440x560?text=32.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Cuissardes" data-src="https://placehold.it/220x280?text=33.jpg" data-srcset="https://placehold.it/220x280?text=33.jpg 1x, https://placehold.it/440x560?text=33.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Décolleté" data-src="https://placehold.it/220x280?text=34.jpg" data-srcset="https://placehold.it/220x280?text=34.jpg 1x, https://placehold.it/440x560?text=34.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Stivaletti" data-src="https://placehold.it/220x280?text=35.jpg" data-srcset="https://placehold.it/220x280?text=35.jpg 1x, https://placehold.it/440x560?text=35.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Sneakers &amp; Tennis shoes basse" data-src="https://placehold.it/220x280?text=36.jpg" data-srcset="https://placehold.it/220x280?text=36.jpg 1x, https://placehold.it/440x560?text=36.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Mocassini" data-src="https://placehold.it/220x280?text=37.jpg" data-srcset="https://placehold.it/220x280?text=37.jpg 1x, https://placehold.it/440x560?text=37.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Sneakers &amp; Tennis shoes basse" data-src="https://placehold.it/220x280?text=38.jpg" data-srcset="https://placehold.it/220x280?text=38.jpg 1x, https://placehold.it/440x560?text=38.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Mocassini" data-src="https://placehold.it/220x280?text=39.jpg" data-srcset="https://placehold.it/220x280?text=39.jpg 1x, https://placehold.it/440x560?text=39.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Mocassini" data-src="https://placehold.it/220x280?text=40.jpg" data-srcset="https://placehold.it/220x280?text=40.jpg 1x, https://placehold.it/440x560?text=40.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+		</ul>
+	</div>
+	<script src="../dist/lazyload.js"></script>
+	<script>
+		(function () {
+			function logEvent(eventName, element) {
+				console.log(Date.now(), eventName, element.getAttribute('data-src'), element.getAttribute('src'));
+			}
+
+			var llWebp = new LazyLoad({
+				elements_selector: ".lazy",
+				to_webp: true,
+
+				callback_enter: function (element) {
+					logEvent("ENTERED", element);
+				},
+				callback_load: function (element) {
+					logEvent("LOADED", element);
+				},
+				callback_set: function (element) {
+					logEvent("SET", element);
+				},
+				callback_error: function (element) {
+					logEvent("ERROR", element);
+					element.src = "https://placehold.it/220x280?text=Placeholder";
+				}
+			});
+
+		}());
+	</script>
+</body>
+
+</html>
\ No newline at end of file
diff --git a/demos/to_webp_some.html b/demos/to_webp_some.html
new file mode 100644
index 00000000..ba914663
--- /dev/null
+++ b/demos/to_webp_some.html
@@ -0,0 +1,325 @@
+<!DOCTYPE html>
+<html>
+
+<head lang="en">
+	<meta charset="UTF-8">
+	<title>
+		Lazyload tests
+	</title>
+	<style>
+		ul,
+		li {
+			list-style-type: none;
+			margin: 0;
+			padding: 0;
+		}
+
+		a,
+		img {
+			display: block;
+		}
+
+		img {
+			border: 0;
+		}
+
+		img:not([src]) {
+			visibility: hidden;
+		}
+
+		/* Fixes Firefox anomaly during image load */
+
+		@-moz-document url-prefix() {
+			img:-moz-loading {
+				visibility: hidden;
+			}
+		}
+	</style>
+</head>
+
+<body>
+	<div id="results1" class="results">
+		<ul>
+			<li>
+				<a href="#">
+					<img alt="Stivaletti" src="https://placehold.it/220x280?text=01.jpg" srcset="https://placehold.it/220x280?text=01.jpg 1x, https://placehold.it/440x560?text=01.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Open toe" data-src="https://placehold.it/220x280?text=02.jpg" data-srcset="https://placehold.it/220x280?text=02.jpg 1x, https://placehold.it/440x560?text=02.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Sneakers &amp; Tennis" data-src="https://placehold.it/220x280?text=03.jpg" data-srcset="https://placehold.it/220x280?text=03.jpg 1x, https://placehold.it/440x560?text=03.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Sneakers &amp; Tennis shoes basse" data-src="https://placehold.it/220x280?text=04.jpg" data-srcset="https://placehold.it/220x280?text=04.jpg 1x, https://placehold.it/440x560?text=04.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Sneakers &amp; Tennis shoes alte" data-src="https://placehold.it/220x280?text=05.jpg" data-srcset="https://placehold.it/220x280?text=05.jpg 1x, https://placehold.it/440x560?text=05.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Sneakers &amp; Tennis shoes alte" data-src="https://placehold.it/220x280?text=06.jpg" data-srcset="https://placehold.it/220x280?text=06.jpg 1x, https://placehold.it/440x560?text=06.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Sneakers &amp; Tennis shoes basse" data-src="https://placehold.it/220x280?text=07.jpg" data-srcset="https://placehold.it/220x280?text=07.jpg 1x, https://placehold.it/440x560?text=07.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Sneakers &amp; Tennis shoes basse" data-src="https://placehold.it/220x280?text=08.jpg" data-srcset="https://placehold.it/220x280?text=08.jpg 1x, https://placehold.it/440x560?text=08.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Stivali" data-src="https://placehold.it/220x280?text=09.jpg" data-srcset="https://placehold.it/220x280?text=09.jpg 1x, https://placehold.it/440x560?text=09.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Stivali" data-src="https://placehold.it/220x280?text=10.jpg" data-srcset="https://placehold.it/220x280?text=10.jpg 1x, https://placehold.it/440x560?text=10.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Stivaletti" data-src="https://placehold.it/220x280?text=11.jpg" data-srcset="https://placehold.it/220x280?text=11.jpg 1x, https://placehold.it/440x560?text=11.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Stivaletti" data-src="https://placehold.it/220x280?text=12.jpg" data-srcset="https://placehold.it/220x280?text=12.jpg 1x, https://placehold.it/440x560?text=12.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Stivali" data-src="https://placehold.it/220x280?text=13.jpg" data-srcset="https://placehold.it/220x280?text=13.jpg 1x, https://placehold.it/440x560?text=13.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Stivaletti" data-src="https://placehold.it/220x280?text=14.jpg" data-srcset="https://placehold.it/220x280?text=14.jpg 1x, https://placehold.it/440x560?text=14.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Décolleté" data-src="https://placehold.it/220x280?text=15.jpg" data-srcset="https://placehold.it/220x280?text=15.jpg 1x, https://placehold.it/440x560?text=15.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Mocassini" data-src="https://placehold.it/220x280?text=16.jpg" data-srcset="https://placehold.it/220x280?text=16.jpg 1x, https://placehold.it/440x560?text=16.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Stivaletti" data-src="https://placehold.it/220x280?text=17.jpg" data-srcset="https://placehold.it/220x280?text=17.jpg 1x, https://placehold.it/440x560?text=17.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Décolleté" data-src="https://placehold.it/220x280?text=18.jpg" data-srcset="https://placehold.it/220x280?text=18.jpg 1x, https://placehold.it/440x560?text=18.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Décolleté" data-src="https://placehold.it/220x280?text=19.jpg" data-srcset="https://placehold.it/220x280?text=19.jpg 1x, https://placehold.it/440x560?text=19.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Francesine" data-src="https://placehold.it/220x280?text=20.jpg" data-srcset="https://placehold.it/220x280?text=20.jpg 1x, https://placehold.it/440x560?text=20.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Stivaletti" data-src="https://placehold.it/220x280?text=21.jpg" data-srcset="https://placehold.it/220x280?text=21.jpg 1x, https://placehold.it/440x560?text=21.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy" alt="Décolleté" data-src="https://placehold.it/220x280?text=22.jpg" data-srcset="https://placehold.it/220x280?text=22.jpg 1x, https://placehold.it/440x560?text=22.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Mocassini" data-src="https://placehold.it/220x280?text=23.jpg" data-srcset="https://placehold.it/220x280?text=23.jpg 1x, https://placehold.it/440x560?text=23.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Mocassini" data-src="https://placehold.it/220x280?text=24.jpg" data-srcset="https://placehold.it/220x280?text=24.jpg 1x, https://placehold.it/440x560?text=24.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Stivali" data-src="https://placehold.it/220x280?text=25.jpg" data-srcset="https://placehold.it/220x280?text=25.jpg 1x, https://placehold.it/440x560?text=25.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Stivaletti" data-src="https://placehold.it/220x280?text=26.jpg" data-srcset="https://placehold.it/220x280?text=26.jpg 1x, https://placehold.it/440x560?text=26.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Stivaletti" data-src="https://placehold.it/220x280?text=27.jpg" data-srcset="https://placehold.it/220x280?text=27.jpg 1x, https://placehold.it/440x560?text=27.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Mocassini" data-src="https://placehold.it/220x280?text=28.jpg" data-srcset="https://placehold.it/220x280?text=28.jpg 1x, https://placehold.it/440x560?text=28.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Stivaletti" data-src="https://placehold.it/220x280?text=29.jpg" data-srcset="https://placehold.it/220x280?text=29.jpg 1x, https://placehold.it/440x560?text=29.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Stivaletti" data-src="https://placehold.it/220x280?text=30.jpg" data-srcset="https://placehold.it/220x280?text=30.jpg 1x, https://placehold.it/440x560?text=30.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Stivaletti" data-src="https://placehold.it/220x280?text=31.jpg" data-srcset="https://placehold.it/220x280?text=31.jpg 1x, https://placehold.it/440x560?text=31.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Stivaletti" data-src="https://placehold.it/220x280?text=32.jpg" data-srcset="https://placehold.it/220x280?text=32.jpg 1x, https://placehold.it/440x560?text=32.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Cuissardes" data-src="https://placehold.it/220x280?text=33.jpg" data-srcset="https://placehold.it/220x280?text=33.jpg 1x, https://placehold.it/440x560?text=33.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Décolleté" data-src="https://placehold.it/220x280?text=34.jpg" data-srcset="https://placehold.it/220x280?text=34.jpg 1x, https://placehold.it/440x560?text=34.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Stivaletti" data-src="https://placehold.it/220x280?text=35.jpg" data-srcset="https://placehold.it/220x280?text=35.jpg 1x, https://placehold.it/440x560?text=35.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Sneakers &amp; Tennis shoes basse" data-src="https://placehold.it/220x280?text=36.jpg" data-srcset="https://placehold.it/220x280?text=36.jpg 1x, https://placehold.it/440x560?text=36.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Mocassini" data-src="https://placehold.it/220x280?text=37.jpg" data-srcset="https://placehold.it/220x280?text=37.jpg 1x, https://placehold.it/440x560?text=37.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Sneakers &amp; Tennis shoes basse" data-src="https://placehold.it/220x280?text=38.jpg" data-srcset="https://placehold.it/220x280?text=38.jpg 1x, https://placehold.it/440x560?text=38.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Mocassini" data-src="https://placehold.it/220x280?text=39.jpg" data-srcset="https://placehold.it/220x280?text=39.jpg 1x, https://placehold.it/440x560?text=39.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+			<li>
+				<a href="#">
+					<img class="lazy has-webp" alt="Mocassini" data-src="https://placehold.it/220x280?text=40.jpg" data-srcset="https://placehold.it/220x280?text=40.jpg 1x, https://placehold.it/440x560?text=40.jpg 2x"
+					 width="220" height="280">
+				</a>
+			</li>
+		</ul>
+	</div>
+	<script src="../dist/lazyload.min.js"></script>
+	<script>
+		(function () {
+			function logEvent(eventName, element) {
+				console.log(Date.now(), eventName, element.getAttribute('data-src'), element.getAttribute('src'));
+			}
+
+			var callback_enter = function (element) {
+				logEvent("ENTERED", element);
+			};
+			var callback_load = function (element) {
+				logEvent("LOADED", element);
+			};
+			var callback_set = function (element) {
+				logEvent("SET", element);
+			};
+			var callback_error = function (element) {
+				logEvent("ERROR", element);
+				element.src = "https://placehold.it/220x280?text=Placeholder";
+			};
+
+			var llWebp = new LazyLoad({
+				elements_selector: ".lazy.has-webp",
+				to_webp: true,
+				callback_enter: callback_enter,
+				callback_load: callback_load,
+				callback_set: callback_set,
+				callback_error: callback_error
+			});
+			var llStandard = new LazyLoad({
+				elements_selector: ".lazy:not(.has-webp)",
+				callback_enter: callback_enter,
+				callback_load: callback_load,
+				callback_set: callback_set,
+				callback_error: callback_error
+			});
+		}());
+	</script>
+</body>
+
+</html>
\ No newline at end of file

From cbbe0824c4e00e5743c8c3b687a82499e11094b8 Mon Sep 17 00:00:00 2001
From: Andrea Verlicchi <verlicchia@yoox.net>
Date: Mon, 6 Aug 2018 15:57:36 +0200
Subject: [PATCH 10/12] Finished webP support

---
 src/lazyload.defaults.js    |  2 +-
 src/lazyload.environment.js | 17 ++++++++++++++++-
 src/lazyload.setSources.js  |  9 +++++++--
 3 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/src/lazyload.defaults.js b/src/lazyload.defaults.js
index 522dc627..feb8726a 100644
--- a/src/lazyload.defaults.js
+++ b/src/lazyload.defaults.js
@@ -13,7 +13,7 @@ export default customSettings => {
 		callback_error: null,
 		callback_set: null,
 		callback_enter: null,
-		ext_to_webp: false
+		to_webp: false
 	};
 
 	return Object.assign({}, defaultSettings, customSettings);
diff --git a/src/lazyload.environment.js b/src/lazyload.environment.js
index f1d2202f..f8b98b08 100644
--- a/src/lazyload.environment.js
+++ b/src/lazyload.environment.js
@@ -10,4 +10,19 @@ export const supportsIntersectionObserver =
 export const supportsClassList =
 	runningOnBrowser && "classList" in document.createElement("p");
 
-export const supportsWebP = runningOnBrowser && false; // && TODO
+export const detectWebP = () => {
+	if (!runningOnBrowser) {
+		return false;
+	}
+
+	var webPString = "image/webp";
+	var elem = document.createElement("canvas");
+
+	if (elem.getContext && elem.getContext("2d")) {
+		return elem.toDataURL(webPString).indexOf("data:" + webPString) === 0;
+	}
+
+	return false;
+};
+
+export const supportsWebP = detectWebP();
diff --git a/src/lazyload.setSources.js b/src/lazyload.setSources.js
index 7cee4db9..8648573e 100644
--- a/src/lazyload.setSources.js
+++ b/src/lazyload.setSources.js
@@ -40,9 +40,14 @@ export const setSources = function(element, settings) {
 	switch (element.tagName) {
 		case "IMG": {
 			const parent = element.parentNode;
-			const mustChangeToWebP = supportsWebP && settings.ext_to_webp;
+			const mustChangeToWebP = supportsWebP && settings.to_webp;
 			if (parent && parent.tagName === "PICTURE") {
-				setSourcesInChildren(parent, "srcset", srcsetDataName);
+				setSourcesInChildren(
+					parent,
+					"srcset",
+					srcsetDataName,
+					mustChangeToWebP
+				);
 			}
 			const sizesDataValue = getData(element, sizesDataName);
 			setAttributeIfNotNullOrEmpty(element, "sizes", sizesDataValue);

From 9f7504a6951080b9e5139b09c4685053c7fc30e1 Mon Sep 17 00:00:00 2001
From: Andrea Verlicchi <verlicchia@yoox.net>
Date: Mon, 6 Aug 2018 16:02:35 +0200
Subject: [PATCH 11/12] Releasing 10.14

---
 CHANGELOG.md                  |   4 ++
 README.md                     |   4 +-
 dist/lazyload.amd.js          |  62 +++++++++++------
 dist/lazyload.amd.min.js      |   2 +-
 dist/lazyload.amd.min.js.map  |   2 +-
 dist/lazyload.es2015.js       | 124 +++++++++++++++++++++++-----------
 dist/lazyload.iife.js         |  62 +++++++++++------
 dist/lazyload.iife.min.js     |   2 +-
 dist/lazyload.iife.min.js.map |   2 +-
 dist/lazyload.js              |  62 +++++++++++------
 dist/lazyload.min.js          |   2 +-
 dist/lazyload.min.js.map      |   2 +-
 package.json                  |   2 +-
 13 files changed, 222 insertions(+), 110 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index ac7ae3ed..472d31a5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## Version 10
 
+#### 10.14.0
+
+Now supporting WebP through dynamic extension rename if the user browser is compatible.
+
 #### 10.13.0
 
 - Shortened the RegEx for crawlers detection (shaved a few bytes)
diff --git a/README.md b/README.md
index cddee71c..1f182106 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,7 @@ Starting from version 9, LazyLoad uses the IntersectionObserver API, which is no
 To include the [latest version](https://cdnjs.com/libraries/vanilla-lazyload) of LazyLoad, use the following script:
 
 ```html
-<script src="https://cdnjs.cloudflare.com/ajax/libs/vanilla-lazyload/10.13.0/lazyload.min.js"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/vanilla-lazyload/10.14.0/lazyload.min.js"></script>
 ```
 
 ### Advanced and best option: conditionally load version 8 or 10
@@ -32,7 +32,7 @@ You can do it with the following script:
 (function(w, d){
 	var b = d.getElementsByTagName('body')[0];
 	var s = d.createElement("script"); s.async = true;
-	var v = !("IntersectionObserver" in w) ? "8.13.0" : "10.13.0";
+	var v = !("IntersectionObserver" in w) ? "8.13.0" : "10.14.0";
 	s.src = "https://cdnjs.cloudflare.com/ajax/libs/vanilla-lazyload/" + v + "/lazyload.min.js";
 	w.lazyLoadOptions = {}; // Your options here. See "recipes" for more information about async.
 	b.appendChild(s);
diff --git a/dist/lazyload.amd.js b/dist/lazyload.amd.js
index 8b7b9fda..fd26ac07 100644
--- a/dist/lazyload.amd.js
+++ b/dist/lazyload.amd.js
@@ -17,7 +17,8 @@ define(function () {
 			callback_load: null,
 			callback_error: null,
 			callback_set: null,
-			callback_enter: null
+			callback_enter: null,
+			to_webp: false
 		};
 
 		return _extends({}, defaultSettings, customSettings);
@@ -82,22 +83,49 @@ define(function () {
 		}
 	}
 
-	var setSourcesInChildren = function setSourcesInChildren(parentTag, attrName, dataAttrName) {
+	var runningOnBrowser = typeof window !== "undefined";
+
+	var isBot = runningOnBrowser && !("onscroll" in window) || /(gle|ing|ro)bot|crawl|spider/i.test(navigator.userAgent);
+
+	var supportsIntersectionObserver = runningOnBrowser && "IntersectionObserver" in window;
+
+	var supportsClassList = runningOnBrowser && "classList" in document.createElement("p");
+
+	var detectWebP = function detectWebP() {
+		if (!runningOnBrowser) {
+			return false;
+		}
+
+		var webPString = "image/webp";
+		var elem = document.createElement("canvas");
+
+		if (elem.getContext && elem.getContext("2d")) {
+			return elem.toDataURL(webPString).indexOf("data:" + webPString) === 0;
+		}
+
+		return false;
+	};
+
+	var supportsWebP = detectWebP();
+
+	var setSourcesInChildren = function setSourcesInChildren(parentTag, attrName, dataAttrName, toWebP) {
 		for (var i = 0, childTag; childTag = parentTag.children[i]; i += 1) {
 			if (childTag.tagName === "SOURCE") {
-				var attributeValue = getData(childTag, dataAttrName);
-				if (attributeValue) {
-					childTag.setAttribute(attrName, attributeValue);
-				}
+				var attrValue = getData(childTag, dataAttrName);
+				setAttributeIfNotNullOrEmpty(childTag, attrName, attrValue, toWebP);
 			}
 		}
 	};
 
-	var setAttributeIfNotNullOrEmpty = function setAttributeIfNotNullOrEmpty(element, attrName, value) {
+	var replaceExtToWebp = function replaceExtToWebp(value, condition) {
+		return condition ? value.replace(/\.(jpe?g|png)/gi, ".webp") : value;
+	};
+
+	var setAttributeIfNotNullOrEmpty = function setAttributeIfNotNullOrEmpty(element, attrName, value, toWebP) {
 		if (!value) {
 			return;
 		}
-		element.setAttribute(attrName, value);
+		element.setAttribute(attrName, replaceExtToWebp(value, toWebP));
 	};
 
 	var setSources = function setSources(element, settings) {
@@ -110,14 +138,15 @@ define(function () {
 			case "IMG":
 				{
 					var parent = element.parentNode;
+					var _mustChangeToWebP = supportsWebP && settings.to_webp;
 					if (parent && parent.tagName === "PICTURE") {
-						setSourcesInChildren(parent, "srcset", srcsetDataName);
+						setSourcesInChildren(parent, "srcset", srcsetDataName, _mustChangeToWebP);
 					}
 					var sizesDataValue = getData(element, sizesDataName);
 					setAttributeIfNotNullOrEmpty(element, "sizes", sizesDataValue);
 					var srcsetDataValue = getData(element, srcsetDataName);
-					setAttributeIfNotNullOrEmpty(element, "srcset", srcsetDataValue);
-					setAttributeIfNotNullOrEmpty(element, "src", srcDataValue);
+					setAttributeIfNotNullOrEmpty(element, "srcset", srcsetDataValue, _mustChangeToWebP);
+					setAttributeIfNotNullOrEmpty(element, "src", srcDataValue, _mustChangeToWebP);
 					break;
 				}
 			case "IFRAME":
@@ -129,19 +158,12 @@ define(function () {
 				break;
 			default:
 				if (srcDataValue) {
-					element.style.backgroundImage = "url(\"" + srcDataValue + "\")";
+					var setValue = replaceExtToWebp(srcDataValue, mustChangeToWebP);
+					element.style.backgroundImage = "url(\"" + setValue + "\")";
 				}
 		}
 	};
 
-	var runningOnBrowser = typeof window !== "undefined";
-
-	var isBot = runningOnBrowser && !("onscroll" in window) || /(gle|ing|ro)bot|crawl|spider/i.test(navigator.userAgent);
-
-	var supportsIntersectionObserver = runningOnBrowser && "IntersectionObserver" in window;
-
-	var supportsClassList = runningOnBrowser && "classList" in document.createElement("p");
-
 	var addClass = function addClass(element, className) {
 		if (supportsClassList) {
 			element.classList.add(className);
diff --git a/dist/lazyload.amd.min.js b/dist/lazyload.amd.min.js
index 9a6225d7..3ff67439 100644
--- a/dist/lazyload.amd.min.js
+++ b/dist/lazyload.amd.min.js
@@ -1,2 +1,2 @@
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diff --git a/dist/lazyload.amd.min.js.map b/dist/lazyload.amd.min.js.map
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\ No newline at end of file
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() { 'use strict';\n\nvar getInstanceSettings = customSettings => {\r\n\tconst defaultSettings = {\r\n\t\telements_selector: \"img\",\r\n\t\tcontainer: document,\r\n\t\tthreshold: 300,\r\n\t\tdata_src: \"src\",\r\n\t\tdata_srcset: \"srcset\",\r\n\t\tdata_sizes: \"sizes\",\r\n\t\tclass_loading: \"loading\",\r\n\t\tclass_loaded: \"loaded\",\r\n\t\tclass_error: \"error\",\r\n\t\tcallback_load: null,\r\n\t\tcallback_error: null,\r\n\t\tcallback_set: null,\r\n\t\tcallback_enter: null,\r\n\t\tto_webp: false\r\n\t};\r\n\r\n\treturn Object.assign({}, defaultSettings, customSettings);\r\n};\n\nconst dataPrefix = \"data-\";\r\nconst processedDataName = \"was-processed\";\r\nconst processedDataValue = \"true\";\r\n\r\nconst getData = (element, attribute) => {\r\n\treturn element.getAttribute(dataPrefix + attribute);\r\n};\r\n\r\nconst setData = (element, attribute, value) => {\r\n\treturn element.setAttribute(dataPrefix + attribute, value);\r\n};\r\n\r\nconst setWasProcessed = element =>\r\n\tsetData(element, processedDataName, processedDataValue);\r\n\r\nconst getWasProcessed = element =>\r\n\tgetData(element, processedDataName) === processedDataValue;\n\nfunction purgeElements(elements) {\r\n\treturn elements.filter(element => !getWasProcessed(element));\r\n}\n\n/* Creates instance and notifies it through the window element */\r\nconst createInstance = function(classObj, options) {\r\n\tvar event;\r\n\tlet eventString = \"LazyLoad::Initialized\";\r\n\tlet instance = new classObj(options);\r\n\ttry {\r\n\t\t// Works in modern browsers\r\n\t\tevent = new CustomEvent(eventString, { detail: { instance } });\r\n\t} catch (err) {\r\n\t\t// Works in Internet Explorer (all versions)\r\n\t\tevent = document.createEvent(\"CustomEvent\");\r\n\t\tevent.initCustomEvent(eventString, false, false, { instance });\r\n\t}\r\n\twindow.dispatchEvent(event);\r\n};\r\n\r\n/* Auto initialization of one or more instances of lazyload, depending on the \r\n    options passed in (plain object or an array) */\r\nfunction autoInitialize(classObj, options) {\r\n\tif (!options) {\r\n\t\treturn;\r\n\t}\r\n\tif (!options.length) {\r\n\t\t// Plain object\r\n\t\tcreateInstance(classObj, options);\r\n\t} else {\r\n\t\t// Array of objects\r\n\t\tfor (let i = 0, optionsItem; (optionsItem = options[i]); i += 1) {\r\n\t\t\tcreateInstance(classObj, optionsItem);\r\n\t\t}\r\n\t}\r\n}\n\nconst runningOnBrowser = typeof window !== \"undefined\";\r\n\r\nconst isBot =\r\n\t(runningOnBrowser && !(\"onscroll\" in window)) ||\r\n\t/(gle|ing|ro)bot|crawl|spider/i.test(navigator.userAgent);\r\n\r\nconst supportsIntersectionObserver =\r\n\trunningOnBrowser && \"IntersectionObserver\" in window;\r\n\r\nconst supportsClassList =\r\n\trunningOnBrowser && \"classList\" in document.createElement(\"p\");\r\n\r\nconst detectWebP = () => {\r\n\tif (!runningOnBrowser) {\r\n\t\treturn false;\r\n\t}\r\n\r\n\tvar webPString = \"image/webp\";\r\n\tvar elem = document.createElement(\"canvas\");\r\n\r\n\tif (elem.getContext && elem.getContext(\"2d\")) {\r\n\t\treturn elem.toDataURL(webPString).indexOf(\"data:\" + webPString) === 0;\r\n\t}\r\n\r\n\treturn false;\r\n};\r\n\r\nconst supportsWebP = detectWebP();\n\nconst setSourcesInChildren = function(\r\n\tparentTag,\r\n\tattrName,\r\n\tdataAttrName,\r\n\ttoWebP\r\n) {\r\n\tfor (let i = 0, childTag; (childTag = parentTag.children[i]); i += 1) {\r\n\t\tif (childTag.tagName === \"SOURCE\") {\r\n\t\t\tlet attrValue = getData(childTag, dataAttrName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(childTag, attrName, attrValue, toWebP);\r\n\t\t}\r\n\t}\r\n};\r\n\r\nconst replaceExtToWebp = (value, condition) =>\r\n\tcondition ? value.replace(/\\.(jpe?g|png)/gi, \".webp\") : value;\r\n\r\nconst setAttributeIfNotNullOrEmpty = function(\r\n\telement,\r\n\tattrName,\r\n\tvalue,\r\n\ttoWebP\r\n) {\r\n\tif (!value) {\r\n\t\treturn;\r\n\t}\r\n\telement.setAttribute(attrName, replaceExtToWebp(value, toWebP));\r\n};\r\n\r\nconst setSources = function(element, settings) {\r\n\tconst {\r\n\t\tdata_sizes: sizesDataName,\r\n\t\tdata_srcset: srcsetDataName,\r\n\t\tdata_src: srcDataName\r\n\t} = settings;\r\n\tconst srcDataValue = getData(element, srcDataName);\r\n\tswitch (element.tagName) {\r\n\t\tcase \"IMG\": {\r\n\t\t\tconst parent = element.parentNode;\r\n\t\t\tconst mustChangeToWebP = supportsWebP && settings.to_webp;\r\n\t\t\tif (parent && parent.tagName === \"PICTURE\") {\r\n\t\t\t\tsetSourcesInChildren(\r\n\t\t\t\t\tparent,\r\n\t\t\t\t\t\"srcset\",\r\n\t\t\t\t\tsrcsetDataName,\r\n\t\t\t\t\tmustChangeToWebP\r\n\t\t\t\t);\r\n\t\t\t}\r\n\t\t\tconst sizesDataValue = getData(element, sizesDataName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(element, \"sizes\", sizesDataValue);\r\n\t\t\tconst srcsetDataValue = getData(element, srcsetDataName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(\r\n\t\t\t\telement,\r\n\t\t\t\t\"srcset\",\r\n\t\t\t\tsrcsetDataValue,\r\n\t\t\t\tmustChangeToWebP\r\n\t\t\t);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(\r\n\t\t\t\telement,\r\n\t\t\t\t\"src\",\r\n\t\t\t\tsrcDataValue,\r\n\t\t\t\tmustChangeToWebP\r\n\t\t\t);\r\n\t\t\tbreak;\r\n\t\t}\r\n\t\tcase \"IFRAME\":\r\n\t\t\tsetAttributeIfNotNullOrEmpty(element, \"src\", srcDataValue);\r\n\t\t\tbreak;\r\n\t\tcase \"VIDEO\":\r\n\t\t\tsetSourcesInChildren(element, \"src\", srcDataName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(element, \"src\", srcDataValue);\r\n\t\t\tbreak;\r\n\t\tdefault:\r\n\t\t\tif (srcDataValue) {\r\n\t\t\t\tlet setValue = replaceExtToWebp(srcDataValue, mustChangeToWebP);\r\n\t\t\t\telement.style.backgroundImage = `url(\"${setValue}\")`;\r\n\t\t\t}\r\n\t}\r\n};\n\nconst addClass = (element, className) => {\r\n\tif (supportsClassList) {\r\n\t\telement.classList.add(className);\r\n\t\treturn;\r\n\t}\r\n\telement.className += (element.className ? \" \" : \"\") + className;\r\n};\r\n\r\nconst removeClass = (element, className) => {\r\n\tif (supportsClassList) {\r\n\t\telement.classList.remove(className);\r\n\t\treturn;\r\n\t}\r\n\telement.className = element.className.\r\n\t\treplace(new RegExp(\"(^|\\\\s+)\" + className + \"(\\\\s+|$)\"), \" \").\r\n\t\treplace(/^\\s+/, \"\").\r\n\t\treplace(/\\s+$/, \"\");\r\n};\n\nconst callCallback = function(callback, argument) {\r\n\tif (callback) {\r\n\t\tcallback(argument);\r\n\t}\r\n};\r\n\r\nconst loadString = \"load\";\r\nconst errorString = \"error\";\r\n\r\nconst removeListeners = function(element, loadHandler, errorHandler) {\r\n\telement.removeEventListener(loadString, loadHandler);\r\n\telement.removeEventListener(errorString, errorHandler);\r\n};\r\n\r\nconst addOneShotListeners = function(element, settings) {\r\n\tconst onLoad = event => {\r\n\t\tonEvent(event, true, settings);\r\n\t\tremoveListeners(element, onLoad, onError);\r\n\t};\r\n\tconst onError = event => {\r\n\t\tonEvent(event, false, settings);\r\n\t\tremoveListeners(element, onLoad, onError);\r\n\t};\r\n\telement.addEventListener(loadString, onLoad);\r\n\telement.addEventListener(errorString, onError);\r\n};\r\n\r\nconst onEvent = function(event, success, settings) {\r\n\tconst element = event.target;\r\n\tremoveClass(element, settings.class_loading);\r\n\taddClass(element, success ? settings.class_loaded : settings.class_error); // Setting loaded or error class\r\n\tcallCallback(\r\n\t\tsuccess ? settings.callback_load : settings.callback_error,\r\n\t\telement\r\n\t);\r\n};\r\n\r\nfunction revealElement(element, settings, force) {\r\n\tif (!force && getWasProcessed(element)) {\r\n\t\treturn; // element has already been processed and force wasn't true\r\n\t}\r\n\tcallCallback(settings.callback_enter, element);\r\n\tif ([\"IMG\", \"IFRAME\", \"VIDEO\"].indexOf(element.tagName) > -1) {\r\n\t\taddOneShotListeners(element, settings);\r\n\t\taddClass(element, settings.class_loading);\r\n\t}\r\n\tsetSources(element, settings);\r\n\tsetWasProcessed(element);\r\n\tcallCallback(settings.callback_set, element);\r\n}\n\n/* entry.isIntersecting needs fallback because is null on some versions of MS Edge, and\r\n   entry.intersectionRatio is not enough alone because it could be 0 on some intersecting elements */\r\nconst isIntersecting = element =>\r\n\telement.isIntersecting || element.intersectionRatio > 0;\r\n\r\nconst getObserverSettings = settings => ({\r\n\troot: settings.container === document ? null : settings.container,\r\n\trootMargin: settings.threshold + \"px\"\r\n});\n\nconst LazyLoad = function(customSettings, elements) {\r\n\tthis._settings = getInstanceSettings(customSettings);\r\n\tthis._setObserver();\r\n\tthis.update(elements);\r\n};\r\n\r\nLazyLoad.prototype = {\r\n\t_setObserver: function() {\r\n\t\tif (!supportsIntersectionObserver) {\r\n\t\t\treturn;\r\n\t\t}\r\n\t\tconst revealIntersectingElements = entries => {\r\n\t\t\tentries.forEach(entry => {\r\n\t\t\t\tif (isIntersecting(entry)) {\r\n\t\t\t\t\tlet element = entry.target;\r\n\t\t\t\t\tthis.load(element);\r\n\t\t\t\t\tthis._observer.unobserve(element);\r\n\t\t\t\t}\r\n\t\t\t});\r\n\t\t\tthis._elements = purgeElements(this._elements);\r\n\t\t};\r\n\t\tthis._observer = new IntersectionObserver(\r\n\t\t\trevealIntersectingElements,\r\n\t\t\tgetObserverSettings(this._settings)\r\n\t\t);\r\n\t},\r\n\r\n\tloadAll: function() {\r\n\t\tthis._elements.forEach(element => {\r\n\t\t\tthis.load(element);\r\n\t\t});\r\n\t\tthis._elements = purgeElements(this._elements);\r\n\t},\r\n\r\n\tupdate: function(elements) {\r\n\t\tconst settings = this._settings;\r\n\t\tconst nodeSet =\r\n\t\t\telements ||\r\n\t\t\tsettings.container.querySelectorAll(settings.elements_selector);\r\n\r\n\t\tthis._elements = purgeElements(Array.prototype.slice.call(nodeSet)); // nodeset to array for IE compatibility\r\n\r\n\t\tif (isBot || !this._observer) {\r\n\t\t\tthis.loadAll();\r\n\t\t\treturn;\r\n\t\t}\r\n\r\n\t\tthis._elements.forEach(element => {\r\n\t\t\tthis._observer.observe(element);\r\n\t\t});\r\n\t},\r\n\r\n\tdestroy: function() {\r\n\t\tif (this._observer) {\r\n\t\t\tpurgeElements(this._elements).forEach(element => {\r\n\t\t\t\tthis._observer.unobserve(element);\r\n\t\t\t});\r\n\t\t\tthis._observer = null;\r\n\t\t}\r\n\t\tthis._elements = null;\r\n\t\tthis._settings = null;\r\n\t},\r\n\r\n\tload: function(element, force) {\r\n\t\trevealElement(element, this._settings, force);\r\n\t}\r\n};\r\n\r\n/* Automatic instances creation if required (useful for async script loading) */\r\nif (runningOnBrowser) {\r\n\tautoInitialize(LazyLoad, window.lazyLoadOptions);\r\n}\n\nreturn LazyLoad;\n\n});\n"]}
\ No newline at end of file
diff --git a/dist/lazyload.es2015.js b/dist/lazyload.es2015.js
index 74b79811..1a06446c 100644
--- a/dist/lazyload.es2015.js
+++ b/dist/lazyload.es2015.js
@@ -1,21 +1,22 @@
-var getInstanceSettings = (customSettings) => {
-    const defaultSettings = {
-        elements_selector: "img",
-        container: document,
-        threshold: 300,
-        data_src: "src",
-        data_srcset: "srcset",
-        data_sizes: "sizes",
-        class_loading: "loading",
-        class_loaded: "loaded",
-        class_error: "error",
-        callback_load: null,
-        callback_error: null,
-        callback_set: null,
-        callback_enter: null
-    };
-
-    return Object.assign({}, defaultSettings, customSettings);
+var getInstanceSettings = customSettings => {
+	const defaultSettings = {
+		elements_selector: "img",
+		container: document,
+		threshold: 300,
+		data_src: "src",
+		data_srcset: "srcset",
+		data_sizes: "sizes",
+		class_loading: "loading",
+		class_loaded: "loaded",
+		class_error: "error",
+		callback_load: null,
+		callback_error: null,
+		callback_set: null,
+		callback_enter: null,
+		to_webp: false
+	};
+
+	return Object.assign({}, defaultSettings, customSettings);
 };
 
 const dataPrefix = "data-";
@@ -73,26 +74,62 @@ function autoInitialize(classObj, options) {
 	}
 }
 
+const runningOnBrowser = typeof window !== "undefined";
+
+const isBot =
+	(runningOnBrowser && !("onscroll" in window)) ||
+	/(gle|ing|ro)bot|crawl|spider/i.test(navigator.userAgent);
+
+const supportsIntersectionObserver =
+	runningOnBrowser && "IntersectionObserver" in window;
+
+const supportsClassList =
+	runningOnBrowser && "classList" in document.createElement("p");
+
+const detectWebP = () => {
+	if (!runningOnBrowser) {
+		return false;
+	}
+
+	var webPString = "image/webp";
+	var elem = document.createElement("canvas");
+
+	if (elem.getContext && elem.getContext("2d")) {
+		return elem.toDataURL(webPString).indexOf("data:" + webPString) === 0;
+	}
+
+	return false;
+};
+
+const supportsWebP = detectWebP();
+
 const setSourcesInChildren = function(
 	parentTag,
 	attrName,
-	dataAttrName
+	dataAttrName,
+	toWebP
 ) {
 	for (let i = 0, childTag; (childTag = parentTag.children[i]); i += 1) {
 		if (childTag.tagName === "SOURCE") {
-			let attributeValue = getData(childTag, dataAttrName);
-			if (attributeValue) {
-				childTag.setAttribute(attrName, attributeValue);
-			}
+			let attrValue = getData(childTag, dataAttrName);
+			setAttributeIfNotNullOrEmpty(childTag, attrName, attrValue, toWebP);
 		}
 	}
 };
 
-const setAttributeIfNotNullOrEmpty = function(element, attrName, value) {
+const replaceExtToWebp = (value, condition) =>
+	condition ? value.replace(/\.(jpe?g|png)/gi, ".webp") : value;
+
+const setAttributeIfNotNullOrEmpty = function(
+	element,
+	attrName,
+	value,
+	toWebP
+) {
 	if (!value) {
 		return;
 	}
-	element.setAttribute(attrName, value);
+	element.setAttribute(attrName, replaceExtToWebp(value, toWebP));
 };
 
 const setSources = function(element, settings) {
@@ -105,14 +142,30 @@ const setSources = function(element, settings) {
 	switch (element.tagName) {
 		case "IMG": {
 			const parent = element.parentNode;
+			const mustChangeToWebP = supportsWebP && settings.to_webp;
 			if (parent && parent.tagName === "PICTURE") {
-				setSourcesInChildren(parent, "srcset", srcsetDataName);
+				setSourcesInChildren(
+					parent,
+					"srcset",
+					srcsetDataName,
+					mustChangeToWebP
+				);
 			}
 			const sizesDataValue = getData(element, sizesDataName);
 			setAttributeIfNotNullOrEmpty(element, "sizes", sizesDataValue);
 			const srcsetDataValue = getData(element, srcsetDataName);
-			setAttributeIfNotNullOrEmpty(element, "srcset", srcsetDataValue);
-			setAttributeIfNotNullOrEmpty(element, "src", srcDataValue);
+			setAttributeIfNotNullOrEmpty(
+				element,
+				"srcset",
+				srcsetDataValue,
+				mustChangeToWebP
+			);
+			setAttributeIfNotNullOrEmpty(
+				element,
+				"src",
+				srcDataValue,
+				mustChangeToWebP
+			);
 			break;
 		}
 		case "IFRAME":
@@ -124,23 +177,12 @@ const setSources = function(element, settings) {
 			break;
 		default:
 			if (srcDataValue) {
-				element.style.backgroundImage = `url("${srcDataValue}")`;
+				let setValue = replaceExtToWebp(srcDataValue, mustChangeToWebP);
+				element.style.backgroundImage = `url("${setValue}")`;
 			}
 	}
 };
 
-const runningOnBrowser = typeof window !== "undefined";
-
-const isBot =
-	(runningOnBrowser && !("onscroll" in window)) ||
-	/(gle|ing|ro)bot|crawl|spider/i.test(navigator.userAgent);
-
-const supportsIntersectionObserver =
-	runningOnBrowser && "IntersectionObserver" in window;
-
-const supportsClassList =
-	runningOnBrowser && "classList" in document.createElement("p");
-
 const addClass = (element, className) => {
 	if (supportsClassList) {
 		element.classList.add(className);
diff --git a/dist/lazyload.iife.js b/dist/lazyload.iife.js
index e1fb6747..698b6e3a 100644
--- a/dist/lazyload.iife.js
+++ b/dist/lazyload.iife.js
@@ -17,7 +17,8 @@ var LazyLoad = function () {
 			callback_load: null,
 			callback_error: null,
 			callback_set: null,
-			callback_enter: null
+			callback_enter: null,
+			to_webp: false
 		};
 
 		return _extends({}, defaultSettings, customSettings);
@@ -82,22 +83,49 @@ var LazyLoad = function () {
 		}
 	}
 
-	var setSourcesInChildren = function setSourcesInChildren(parentTag, attrName, dataAttrName) {
+	var runningOnBrowser = typeof window !== "undefined";
+
+	var isBot = runningOnBrowser && !("onscroll" in window) || /(gle|ing|ro)bot|crawl|spider/i.test(navigator.userAgent);
+
+	var supportsIntersectionObserver = runningOnBrowser && "IntersectionObserver" in window;
+
+	var supportsClassList = runningOnBrowser && "classList" in document.createElement("p");
+
+	var detectWebP = function detectWebP() {
+		if (!runningOnBrowser) {
+			return false;
+		}
+
+		var webPString = "image/webp";
+		var elem = document.createElement("canvas");
+
+		if (elem.getContext && elem.getContext("2d")) {
+			return elem.toDataURL(webPString).indexOf("data:" + webPString) === 0;
+		}
+
+		return false;
+	};
+
+	var supportsWebP = detectWebP();
+
+	var setSourcesInChildren = function setSourcesInChildren(parentTag, attrName, dataAttrName, toWebP) {
 		for (var i = 0, childTag; childTag = parentTag.children[i]; i += 1) {
 			if (childTag.tagName === "SOURCE") {
-				var attributeValue = getData(childTag, dataAttrName);
-				if (attributeValue) {
-					childTag.setAttribute(attrName, attributeValue);
-				}
+				var attrValue = getData(childTag, dataAttrName);
+				setAttributeIfNotNullOrEmpty(childTag, attrName, attrValue, toWebP);
 			}
 		}
 	};
 
-	var setAttributeIfNotNullOrEmpty = function setAttributeIfNotNullOrEmpty(element, attrName, value) {
+	var replaceExtToWebp = function replaceExtToWebp(value, condition) {
+		return condition ? value.replace(/\.(jpe?g|png)/gi, ".webp") : value;
+	};
+
+	var setAttributeIfNotNullOrEmpty = function setAttributeIfNotNullOrEmpty(element, attrName, value, toWebP) {
 		if (!value) {
 			return;
 		}
-		element.setAttribute(attrName, value);
+		element.setAttribute(attrName, replaceExtToWebp(value, toWebP));
 	};
 
 	var setSources = function setSources(element, settings) {
@@ -110,14 +138,15 @@ var LazyLoad = function () {
 			case "IMG":
 				{
 					var parent = element.parentNode;
+					var _mustChangeToWebP = supportsWebP && settings.to_webp;
 					if (parent && parent.tagName === "PICTURE") {
-						setSourcesInChildren(parent, "srcset", srcsetDataName);
+						setSourcesInChildren(parent, "srcset", srcsetDataName, _mustChangeToWebP);
 					}
 					var sizesDataValue = getData(element, sizesDataName);
 					setAttributeIfNotNullOrEmpty(element, "sizes", sizesDataValue);
 					var srcsetDataValue = getData(element, srcsetDataName);
-					setAttributeIfNotNullOrEmpty(element, "srcset", srcsetDataValue);
-					setAttributeIfNotNullOrEmpty(element, "src", srcDataValue);
+					setAttributeIfNotNullOrEmpty(element, "srcset", srcsetDataValue, _mustChangeToWebP);
+					setAttributeIfNotNullOrEmpty(element, "src", srcDataValue, _mustChangeToWebP);
 					break;
 				}
 			case "IFRAME":
@@ -129,19 +158,12 @@ var LazyLoad = function () {
 				break;
 			default:
 				if (srcDataValue) {
-					element.style.backgroundImage = "url(\"" + srcDataValue + "\")";
+					var setValue = replaceExtToWebp(srcDataValue, mustChangeToWebP);
+					element.style.backgroundImage = "url(\"" + setValue + "\")";
 				}
 		}
 	};
 
-	var runningOnBrowser = typeof window !== "undefined";
-
-	var isBot = runningOnBrowser && !("onscroll" in window) || /(gle|ing|ro)bot|crawl|spider/i.test(navigator.userAgent);
-
-	var supportsIntersectionObserver = runningOnBrowser && "IntersectionObserver" in window;
-
-	var supportsClassList = runningOnBrowser && "classList" in document.createElement("p");
-
 	var addClass = function addClass(element, className) {
 		if (supportsClassList) {
 			element.classList.add(className);
diff --git a/dist/lazyload.iife.min.js b/dist/lazyload.iife.min.js
index 30e15b36..ba18c7ad 100644
--- a/dist/lazyload.iife.min.js
+++ b/dist/lazyload.iife.min.js
@@ -1,2 +1,2 @@
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\ No newline at end of file
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LazyLoad = (function () {\n'use strict';\n\nvar getInstanceSettings = customSettings => {\r\n\tconst defaultSettings = {\r\n\t\telements_selector: \"img\",\r\n\t\tcontainer: document,\r\n\t\tthreshold: 300,\r\n\t\tdata_src: \"src\",\r\n\t\tdata_srcset: \"srcset\",\r\n\t\tdata_sizes: \"sizes\",\r\n\t\tclass_loading: \"loading\",\r\n\t\tclass_loaded: \"loaded\",\r\n\t\tclass_error: \"error\",\r\n\t\tcallback_load: null,\r\n\t\tcallback_error: null,\r\n\t\tcallback_set: null,\r\n\t\tcallback_enter: null,\r\n\t\tto_webp: false\r\n\t};\r\n\r\n\treturn Object.assign({}, defaultSettings, customSettings);\r\n};\n\nconst dataPrefix = \"data-\";\r\nconst processedDataName = \"was-processed\";\r\nconst processedDataValue = \"true\";\r\n\r\nconst getData = (element, attribute) => {\r\n\treturn element.getAttribute(dataPrefix + attribute);\r\n};\r\n\r\nconst setData = (element, attribute, value) => {\r\n\treturn element.setAttribute(dataPrefix + attribute, value);\r\n};\r\n\r\nconst setWasProcessed = element =>\r\n\tsetData(element, processedDataName, processedDataValue);\r\n\r\nconst getWasProcessed = element =>\r\n\tgetData(element, processedDataName) === processedDataValue;\n\nfunction purgeElements(elements) {\r\n\treturn elements.filter(element => !getWasProcessed(element));\r\n}\n\n/* Creates instance and notifies it through the window element */\r\nconst createInstance = function(classObj, options) {\r\n\tvar event;\r\n\tlet eventString = \"LazyLoad::Initialized\";\r\n\tlet instance = new classObj(options);\r\n\ttry {\r\n\t\t// Works in modern browsers\r\n\t\tevent = new CustomEvent(eventString, { detail: { instance } });\r\n\t} catch (err) {\r\n\t\t// Works in Internet Explorer (all versions)\r\n\t\tevent = document.createEvent(\"CustomEvent\");\r\n\t\tevent.initCustomEvent(eventString, false, false, { instance });\r\n\t}\r\n\twindow.dispatchEvent(event);\r\n};\r\n\r\n/* Auto initialization of one or more instances of lazyload, depending on the \r\n    options passed in (plain object or an array) */\r\nfunction autoInitialize(classObj, options) {\r\n\tif (!options) {\r\n\t\treturn;\r\n\t}\r\n\tif (!options.length) {\r\n\t\t// Plain object\r\n\t\tcreateInstance(classObj, options);\r\n\t} else {\r\n\t\t// Array of objects\r\n\t\tfor (let i = 0, optionsItem; (optionsItem = options[i]); i += 1) {\r\n\t\t\tcreateInstance(classObj, optionsItem);\r\n\t\t}\r\n\t}\r\n}\n\nconst runningOnBrowser = typeof window !== \"undefined\";\r\n\r\nconst isBot =\r\n\t(runningOnBrowser && !(\"onscroll\" in window)) ||\r\n\t/(gle|ing|ro)bot|crawl|spider/i.test(navigator.userAgent);\r\n\r\nconst supportsIntersectionObserver =\r\n\trunningOnBrowser && \"IntersectionObserver\" in window;\r\n\r\nconst supportsClassList =\r\n\trunningOnBrowser && \"classList\" in document.createElement(\"p\");\r\n\r\nconst detectWebP = () => {\r\n\tif (!runningOnBrowser) {\r\n\t\treturn false;\r\n\t}\r\n\r\n\tvar webPString = \"image/webp\";\r\n\tvar elem = document.createElement(\"canvas\");\r\n\r\n\tif (elem.getContext && elem.getContext(\"2d\")) {\r\n\t\treturn elem.toDataURL(webPString).indexOf(\"data:\" + webPString) === 0;\r\n\t}\r\n\r\n\treturn false;\r\n};\r\n\r\nconst supportsWebP = detectWebP();\n\nconst setSourcesInChildren = function(\r\n\tparentTag,\r\n\tattrName,\r\n\tdataAttrName,\r\n\ttoWebP\r\n) {\r\n\tfor (let i = 0, childTag; (childTag = parentTag.children[i]); i += 1) {\r\n\t\tif (childTag.tagName === \"SOURCE\") {\r\n\t\t\tlet attrValue = getData(childTag, dataAttrName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(childTag, attrName, attrValue, toWebP);\r\n\t\t}\r\n\t}\r\n};\r\n\r\nconst replaceExtToWebp = (value, condition) =>\r\n\tcondition ? value.replace(/\\.(jpe?g|png)/gi, \".webp\") : value;\r\n\r\nconst setAttributeIfNotNullOrEmpty = function(\r\n\telement,\r\n\tattrName,\r\n\tvalue,\r\n\ttoWebP\r\n) {\r\n\tif (!value) {\r\n\t\treturn;\r\n\t}\r\n\telement.setAttribute(attrName, replaceExtToWebp(value, toWebP));\r\n};\r\n\r\nconst setSources = function(element, settings) {\r\n\tconst {\r\n\t\tdata_sizes: sizesDataName,\r\n\t\tdata_srcset: srcsetDataName,\r\n\t\tdata_src: srcDataName\r\n\t} = settings;\r\n\tconst srcDataValue = getData(element, srcDataName);\r\n\tswitch (element.tagName) {\r\n\t\tcase \"IMG\": {\r\n\t\t\tconst parent = element.parentNode;\r\n\t\t\tconst mustChangeToWebP = supportsWebP && settings.to_webp;\r\n\t\t\tif (parent && parent.tagName === \"PICTURE\") {\r\n\t\t\t\tsetSourcesInChildren(\r\n\t\t\t\t\tparent,\r\n\t\t\t\t\t\"srcset\",\r\n\t\t\t\t\tsrcsetDataName,\r\n\t\t\t\t\tmustChangeToWebP\r\n\t\t\t\t);\r\n\t\t\t}\r\n\t\t\tconst sizesDataValue = getData(element, sizesDataName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(element, \"sizes\", sizesDataValue);\r\n\t\t\tconst srcsetDataValue = getData(element, srcsetDataName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(\r\n\t\t\t\telement,\r\n\t\t\t\t\"srcset\",\r\n\t\t\t\tsrcsetDataValue,\r\n\t\t\t\tmustChangeToWebP\r\n\t\t\t);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(\r\n\t\t\t\telement,\r\n\t\t\t\t\"src\",\r\n\t\t\t\tsrcDataValue,\r\n\t\t\t\tmustChangeToWebP\r\n\t\t\t);\r\n\t\t\tbreak;\r\n\t\t}\r\n\t\tcase \"IFRAME\":\r\n\t\t\tsetAttributeIfNotNullOrEmpty(element, \"src\", srcDataValue);\r\n\t\t\tbreak;\r\n\t\tcase \"VIDEO\":\r\n\t\t\tsetSourcesInChildren(element, \"src\", srcDataName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(element, \"src\", srcDataValue);\r\n\t\t\tbreak;\r\n\t\tdefault:\r\n\t\t\tif (srcDataValue) {\r\n\t\t\t\tlet setValue = replaceExtToWebp(srcDataValue, mustChangeToWebP);\r\n\t\t\t\telement.style.backgroundImage = `url(\"${setValue}\")`;\r\n\t\t\t}\r\n\t}\r\n};\n\nconst addClass = (element, className) => {\r\n\tif (supportsClassList) {\r\n\t\telement.classList.add(className);\r\n\t\treturn;\r\n\t}\r\n\telement.className += (element.className ? \" \" : \"\") + className;\r\n};\r\n\r\nconst removeClass = (element, className) => {\r\n\tif (supportsClassList) {\r\n\t\telement.classList.remove(className);\r\n\t\treturn;\r\n\t}\r\n\telement.className = element.className.\r\n\t\treplace(new RegExp(\"(^|\\\\s+)\" + className + \"(\\\\s+|$)\"), \" \").\r\n\t\treplace(/^\\s+/, \"\").\r\n\t\treplace(/\\s+$/, \"\");\r\n};\n\nconst callCallback = function(callback, argument) {\r\n\tif (callback) {\r\n\t\tcallback(argument);\r\n\t}\r\n};\r\n\r\nconst loadString = \"load\";\r\nconst errorString = \"error\";\r\n\r\nconst removeListeners = function(element, loadHandler, errorHandler) {\r\n\telement.removeEventListener(loadString, loadHandler);\r\n\telement.removeEventListener(errorString, errorHandler);\r\n};\r\n\r\nconst addOneShotListeners = function(element, settings) {\r\n\tconst onLoad = event => {\r\n\t\tonEvent(event, true, settings);\r\n\t\tremoveListeners(element, onLoad, onError);\r\n\t};\r\n\tconst onError = event => {\r\n\t\tonEvent(event, false, settings);\r\n\t\tremoveListeners(element, onLoad, onError);\r\n\t};\r\n\telement.addEventListener(loadString, onLoad);\r\n\telement.addEventListener(errorString, onError);\r\n};\r\n\r\nconst onEvent = function(event, success, settings) {\r\n\tconst element = event.target;\r\n\tremoveClass(element, settings.class_loading);\r\n\taddClass(element, success ? settings.class_loaded : settings.class_error); // Setting loaded or error class\r\n\tcallCallback(\r\n\t\tsuccess ? settings.callback_load : settings.callback_error,\r\n\t\telement\r\n\t);\r\n};\r\n\r\nfunction revealElement(element, settings, force) {\r\n\tif (!force && getWasProcessed(element)) {\r\n\t\treturn; // element has already been processed and force wasn't true\r\n\t}\r\n\tcallCallback(settings.callback_enter, element);\r\n\tif ([\"IMG\", \"IFRAME\", \"VIDEO\"].indexOf(element.tagName) > -1) {\r\n\t\taddOneShotListeners(element, settings);\r\n\t\taddClass(element, settings.class_loading);\r\n\t}\r\n\tsetSources(element, settings);\r\n\tsetWasProcessed(element);\r\n\tcallCallback(settings.callback_set, element);\r\n}\n\n/* entry.isIntersecting needs fallback because is null on some versions of MS Edge, and\r\n   entry.intersectionRatio is not enough alone because it could be 0 on some intersecting elements */\r\nconst isIntersecting = element =>\r\n\telement.isIntersecting || element.intersectionRatio > 0;\r\n\r\nconst getObserverSettings = settings => ({\r\n\troot: settings.container === document ? null : settings.container,\r\n\trootMargin: settings.threshold + \"px\"\r\n});\n\nconst LazyLoad = function(customSettings, elements) {\r\n\tthis._settings = getInstanceSettings(customSettings);\r\n\tthis._setObserver();\r\n\tthis.update(elements);\r\n};\r\n\r\nLazyLoad.prototype = {\r\n\t_setObserver: function() {\r\n\t\tif (!supportsIntersectionObserver) {\r\n\t\t\treturn;\r\n\t\t}\r\n\t\tconst revealIntersectingElements = entries => {\r\n\t\t\tentries.forEach(entry => {\r\n\t\t\t\tif (isIntersecting(entry)) {\r\n\t\t\t\t\tlet element = entry.target;\r\n\t\t\t\t\tthis.load(element);\r\n\t\t\t\t\tthis._observer.unobserve(element);\r\n\t\t\t\t}\r\n\t\t\t});\r\n\t\t\tthis._elements = purgeElements(this._elements);\r\n\t\t};\r\n\t\tthis._observer = new IntersectionObserver(\r\n\t\t\trevealIntersectingElements,\r\n\t\t\tgetObserverSettings(this._settings)\r\n\t\t);\r\n\t},\r\n\r\n\tloadAll: function() {\r\n\t\tthis._elements.forEach(element => {\r\n\t\t\tthis.load(element);\r\n\t\t});\r\n\t\tthis._elements = purgeElements(this._elements);\r\n\t},\r\n\r\n\tupdate: function(elements) {\r\n\t\tconst settings = this._settings;\r\n\t\tconst nodeSet =\r\n\t\t\telements ||\r\n\t\t\tsettings.container.querySelectorAll(settings.elements_selector);\r\n\r\n\t\tthis._elements = purgeElements(Array.prototype.slice.call(nodeSet)); // nodeset to array for IE compatibility\r\n\r\n\t\tif (isBot || !this._observer) {\r\n\t\t\tthis.loadAll();\r\n\t\t\treturn;\r\n\t\t}\r\n\r\n\t\tthis._elements.forEach(element => {\r\n\t\t\tthis._observer.observe(element);\r\n\t\t});\r\n\t},\r\n\r\n\tdestroy: function() {\r\n\t\tif (this._observer) {\r\n\t\t\tpurgeElements(this._elements).forEach(element => {\r\n\t\t\t\tthis._observer.unobserve(element);\r\n\t\t\t});\r\n\t\t\tthis._observer = null;\r\n\t\t}\r\n\t\tthis._elements = null;\r\n\t\tthis._settings = null;\r\n\t},\r\n\r\n\tload: function(element, force) {\r\n\t\trevealElement(element, this._settings, force);\r\n\t}\r\n};\r\n\r\n/* Automatic instances creation if required (useful for async script loading) */\r\nif (runningOnBrowser) {\r\n\tautoInitialize(LazyLoad, window.lazyLoadOptions);\r\n}\n\nreturn LazyLoad;\n\n}());\n"]}
\ No newline at end of file
diff --git a/dist/lazyload.js b/dist/lazyload.js
index 347ddc57..58442980 100644
--- a/dist/lazyload.js
+++ b/dist/lazyload.js
@@ -21,7 +21,8 @@ var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol
 			callback_load: null,
 			callback_error: null,
 			callback_set: null,
-			callback_enter: null
+			callback_enter: null,
+			to_webp: false
 		};
 
 		return _extends({}, defaultSettings, customSettings);
@@ -86,22 +87,49 @@ var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol
 		}
 	}
 
-	var setSourcesInChildren = function setSourcesInChildren(parentTag, attrName, dataAttrName) {
+	var runningOnBrowser = typeof window !== "undefined";
+
+	var isBot = runningOnBrowser && !("onscroll" in window) || /(gle|ing|ro)bot|crawl|spider/i.test(navigator.userAgent);
+
+	var supportsIntersectionObserver = runningOnBrowser && "IntersectionObserver" in window;
+
+	var supportsClassList = runningOnBrowser && "classList" in document.createElement("p");
+
+	var detectWebP = function detectWebP() {
+		if (!runningOnBrowser) {
+			return false;
+		}
+
+		var webPString = "image/webp";
+		var elem = document.createElement("canvas");
+
+		if (elem.getContext && elem.getContext("2d")) {
+			return elem.toDataURL(webPString).indexOf("data:" + webPString) === 0;
+		}
+
+		return false;
+	};
+
+	var supportsWebP = detectWebP();
+
+	var setSourcesInChildren = function setSourcesInChildren(parentTag, attrName, dataAttrName, toWebP) {
 		for (var i = 0, childTag; childTag = parentTag.children[i]; i += 1) {
 			if (childTag.tagName === "SOURCE") {
-				var attributeValue = getData(childTag, dataAttrName);
-				if (attributeValue) {
-					childTag.setAttribute(attrName, attributeValue);
-				}
+				var attrValue = getData(childTag, dataAttrName);
+				setAttributeIfNotNullOrEmpty(childTag, attrName, attrValue, toWebP);
 			}
 		}
 	};
 
-	var setAttributeIfNotNullOrEmpty = function setAttributeIfNotNullOrEmpty(element, attrName, value) {
+	var replaceExtToWebp = function replaceExtToWebp(value, condition) {
+		return condition ? value.replace(/\.(jpe?g|png)/gi, ".webp") : value;
+	};
+
+	var setAttributeIfNotNullOrEmpty = function setAttributeIfNotNullOrEmpty(element, attrName, value, toWebP) {
 		if (!value) {
 			return;
 		}
-		element.setAttribute(attrName, value);
+		element.setAttribute(attrName, replaceExtToWebp(value, toWebP));
 	};
 
 	var setSources = function setSources(element, settings) {
@@ -114,14 +142,15 @@ var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol
 			case "IMG":
 				{
 					var parent = element.parentNode;
+					var _mustChangeToWebP = supportsWebP && settings.to_webp;
 					if (parent && parent.tagName === "PICTURE") {
-						setSourcesInChildren(parent, "srcset", srcsetDataName);
+						setSourcesInChildren(parent, "srcset", srcsetDataName, _mustChangeToWebP);
 					}
 					var sizesDataValue = getData(element, sizesDataName);
 					setAttributeIfNotNullOrEmpty(element, "sizes", sizesDataValue);
 					var srcsetDataValue = getData(element, srcsetDataName);
-					setAttributeIfNotNullOrEmpty(element, "srcset", srcsetDataValue);
-					setAttributeIfNotNullOrEmpty(element, "src", srcDataValue);
+					setAttributeIfNotNullOrEmpty(element, "srcset", srcsetDataValue, _mustChangeToWebP);
+					setAttributeIfNotNullOrEmpty(element, "src", srcDataValue, _mustChangeToWebP);
 					break;
 				}
 			case "IFRAME":
@@ -133,19 +162,12 @@ var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol
 				break;
 			default:
 				if (srcDataValue) {
-					element.style.backgroundImage = 'url("' + srcDataValue + '")';
+					var setValue = replaceExtToWebp(srcDataValue, mustChangeToWebP);
+					element.style.backgroundImage = 'url("' + setValue + '")';
 				}
 		}
 	};
 
-	var runningOnBrowser = typeof window !== "undefined";
-
-	var isBot = runningOnBrowser && !("onscroll" in window) || /(gle|ing|ro)bot|crawl|spider/i.test(navigator.userAgent);
-
-	var supportsIntersectionObserver = runningOnBrowser && "IntersectionObserver" in window;
-
-	var supportsClassList = runningOnBrowser && "classList" in document.createElement("p");
-
 	var addClass = function addClass(element, className) {
 		if (supportsClassList) {
 			element.classList.add(className);
diff --git a/dist/lazyload.min.js b/dist/lazyload.min.js
index fa23baa5..a63b42a3 100644
--- a/dist/lazyload.min.js
+++ b/dist/lazyload.min.js
@@ -1,2 +1,2 @@
-var _extends=Object.assign||function(e){for(var t=1;t<arguments.length;t++){var n=arguments[t];for(var r in n)Object.prototype.hasOwnProperty.call(n,r)&&(e[r]=n[r])}return e},_typeof="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e};!function(e,t){"object"===("undefined"==typeof exports?"undefined":_typeof(exports))&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):e.LazyLoad=t()}(this,function(){"use strict";function e(e){return e.filter(function(e){return!a(e)})}function t(e,t,n){!n&&a(e)||(h(t.callback_enter,e),["IMG","IFRAME","VIDEO"].indexOf(e.tagName)>-1&&(y(e,t),m(e,t.class_loading)),u(e,t),o(e),h(t.callback_set,e))}var n=function(e){var t={elements_selector:"img",container:document,threshold:300,data_src:"src",data_srcset:"srcset",data_sizes:"sizes",class_loading:"loading",class_loaded:"loaded",class_error:"error",callback_load:null,callback_error:null,callback_set:null,callback_enter:null};return _extends({},t,e)},r=function(e,t){return e.getAttribute("data-"+t)},s=function(e,t,n){return e.setAttribute("data-"+t,n)},o=function(e){return s(e,"was-processed","true")},a=function(e){return"true"===r(e,"was-processed")},i=function(e,t){var n,r=new e(t);try{n=new CustomEvent("LazyLoad::Initialized",{detail:{instance:r}})}catch(e){(n=document.createEvent("CustomEvent")).initCustomEvent("LazyLoad::Initialized",!1,!1,{instance:r})}window.dispatchEvent(n)},c=function(e,t,n){for(var s,o=0;s=e.children[o];o+=1)if("SOURCE"===s.tagName){var a=r(s,n);a&&s.setAttribute(t,a)}},l=function(e,t,n){n&&e.setAttribute(t,n)},u=function(e,t){var n=t.data_sizes,s=t.data_srcset,o=t.data_src,a=r(e,o);switch(e.tagName){case"IMG":var i=e.parentNode;i&&"PICTURE"===i.tagName&&c(i,"srcset",s);var u=r(e,n);l(e,"sizes",u);var d=r(e,s);l(e,"srcset",d),l(e,"src",a);break;case"IFRAME":l(e,"src",a);break;case"VIDEO":c(e,"src",o),l(e,"src",a);break;default:a&&(e.style.backgroundImage='url("'+a+'")')}},d="undefined"!=typeof window,f=d&&!("onscroll"in window)||/(gle|ing|ro)bot|crawl|spider/i.test(navigator.userAgent),_=d&&"IntersectionObserver"in window,v=d&&"classList"in document.createElement("p"),m=function(e,t){v?e.classList.add(t):e.className+=(e.className?" ":"")+t},b=function(e,t){v?e.classList.remove(t):e.className=e.className.replace(new RegExp("(^|\\s+)"+t+"(\\s+|$)")," ").replace(/^\s+/,"").replace(/\s+$/,"")},h=function(e,t){e&&e(t)},p=function(e,t,n){e.removeEventListener("load",t),e.removeEventListener("error",n)},y=function(e,t){var n=function n(s){g(s,!0,t),p(e,n,r)},r=function r(s){g(s,!1,t),p(e,n,r)};e.addEventListener("load",n),e.addEventListener("error",r)},g=function(e,t,n){var r=e.target;b(r,n.class_loading),m(r,t?n.class_loaded:n.class_error),h(t?n.callback_load:n.callback_error,r)},E=function(e){return e.isIntersecting||e.intersectionRatio>0},w=function(e){return{root:e.container===document?null:e.container,rootMargin:e.threshold+"px"}},L=function(e,t){this._settings=n(e),this._setObserver(),this.update(t)};return L.prototype={_setObserver:function(){var t=this;if(_){this._observer=new IntersectionObserver(function(n){n.forEach(function(e){if(E(e)){var n=e.target;t.load(n),t._observer.unobserve(n)}}),t._elements=e(t._elements)},w(this._settings))}},loadAll:function(){var t=this;this._elements.forEach(function(e){t.load(e)}),this._elements=e(this._elements)},update:function(t){var n=this,r=this._settings,s=t||r.container.querySelectorAll(r.elements_selector);this._elements=e(Array.prototype.slice.call(s)),!f&&this._observer?this._elements.forEach(function(e){n._observer.observe(e)}):this.loadAll()},destroy:function(){var t=this;this._observer&&(e(this._elements).forEach(function(e){t._observer.unobserve(e)}),this._observer=null),this._elements=null,this._settings=null},load:function(e,n){t(e,this._settings,n)}},d&&function(e,t){if(t)if(t.length)for(var n,r=0;n=t[r];r+=1)i(e,n);else i(e,t)}(L,window.lazyLoadOptions),L});
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diff --git a/dist/lazyload.min.js.map b/dist/lazyload.min.js.map
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(global, factory) {\n\ttypeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :\n\ttypeof define === 'function' && define.amd ? define(factory) :\n\t(global.LazyLoad = factory());\n}(this, (function () { 'use strict';\n\nvar getInstanceSettings = customSettings => {\r\n\tconst defaultSettings = {\r\n\t\telements_selector: \"img\",\r\n\t\tcontainer: document,\r\n\t\tthreshold: 300,\r\n\t\tdata_src: \"src\",\r\n\t\tdata_srcset: \"srcset\",\r\n\t\tdata_sizes: \"sizes\",\r\n\t\tclass_loading: \"loading\",\r\n\t\tclass_loaded: \"loaded\",\r\n\t\tclass_error: \"error\",\r\n\t\tcallback_load: null,\r\n\t\tcallback_error: null,\r\n\t\tcallback_set: null,\r\n\t\tcallback_enter: null,\r\n\t\tto_webp: false\r\n\t};\r\n\r\n\treturn Object.assign({}, defaultSettings, customSettings);\r\n};\n\nconst dataPrefix = \"data-\";\r\nconst processedDataName = \"was-processed\";\r\nconst processedDataValue = \"true\";\r\n\r\nconst getData = (element, attribute) => {\r\n\treturn element.getAttribute(dataPrefix + attribute);\r\n};\r\n\r\nconst setData = (element, attribute, value) => {\r\n\treturn element.setAttribute(dataPrefix + attribute, value);\r\n};\r\n\r\nconst setWasProcessed = element =>\r\n\tsetData(element, processedDataName, processedDataValue);\r\n\r\nconst getWasProcessed = element =>\r\n\tgetData(element, processedDataName) === processedDataValue;\n\nfunction purgeElements(elements) {\r\n\treturn elements.filter(element => !getWasProcessed(element));\r\n}\n\n/* Creates instance and notifies it through the window element */\r\nconst createInstance = function(classObj, options) {\r\n\tvar event;\r\n\tlet eventString = \"LazyLoad::Initialized\";\r\n\tlet instance = new classObj(options);\r\n\ttry {\r\n\t\t// Works in modern browsers\r\n\t\tevent = new CustomEvent(eventString, { detail: { instance } });\r\n\t} catch (err) {\r\n\t\t// Works in Internet Explorer (all versions)\r\n\t\tevent = document.createEvent(\"CustomEvent\");\r\n\t\tevent.initCustomEvent(eventString, false, false, { instance });\r\n\t}\r\n\twindow.dispatchEvent(event);\r\n};\r\n\r\n/* Auto initialization of one or more instances of lazyload, depending on the \r\n    options passed in (plain object or an array) */\r\nfunction autoInitialize(classObj, options) {\r\n\tif (!options) {\r\n\t\treturn;\r\n\t}\r\n\tif (!options.length) {\r\n\t\t// Plain object\r\n\t\tcreateInstance(classObj, options);\r\n\t} else {\r\n\t\t// Array of objects\r\n\t\tfor (let i = 0, optionsItem; (optionsItem = options[i]); i += 1) {\r\n\t\t\tcreateInstance(classObj, optionsItem);\r\n\t\t}\r\n\t}\r\n}\n\nconst runningOnBrowser = typeof window !== \"undefined\";\r\n\r\nconst isBot =\r\n\t(runningOnBrowser && !(\"onscroll\" in window)) ||\r\n\t/(gle|ing|ro)bot|crawl|spider/i.test(navigator.userAgent);\r\n\r\nconst supportsIntersectionObserver =\r\n\trunningOnBrowser && \"IntersectionObserver\" in window;\r\n\r\nconst supportsClassList =\r\n\trunningOnBrowser && \"classList\" in document.createElement(\"p\");\r\n\r\nconst detectWebP = () => {\r\n\tif (!runningOnBrowser) {\r\n\t\treturn false;\r\n\t}\r\n\r\n\tvar webPString = \"image/webp\";\r\n\tvar elem = document.createElement(\"canvas\");\r\n\r\n\tif (elem.getContext && elem.getContext(\"2d\")) {\r\n\t\treturn elem.toDataURL(webPString).indexOf(\"data:\" + webPString) === 0;\r\n\t}\r\n\r\n\treturn false;\r\n};\r\n\r\nconst supportsWebP = detectWebP();\n\nconst setSourcesInChildren = function(\r\n\tparentTag,\r\n\tattrName,\r\n\tdataAttrName,\r\n\ttoWebP\r\n) {\r\n\tfor (let i = 0, childTag; (childTag = parentTag.children[i]); i += 1) {\r\n\t\tif (childTag.tagName === \"SOURCE\") {\r\n\t\t\tlet attrValue = getData(childTag, dataAttrName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(childTag, attrName, attrValue, toWebP);\r\n\t\t}\r\n\t}\r\n};\r\n\r\nconst replaceExtToWebp = (value, condition) =>\r\n\tcondition ? value.replace(/\\.(jpe?g|png)/gi, \".webp\") : value;\r\n\r\nconst setAttributeIfNotNullOrEmpty = function(\r\n\telement,\r\n\tattrName,\r\n\tvalue,\r\n\ttoWebP\r\n) {\r\n\tif (!value) {\r\n\t\treturn;\r\n\t}\r\n\telement.setAttribute(attrName, replaceExtToWebp(value, toWebP));\r\n};\r\n\r\nconst setSources = function(element, settings) {\r\n\tconst {\r\n\t\tdata_sizes: sizesDataName,\r\n\t\tdata_srcset: srcsetDataName,\r\n\t\tdata_src: srcDataName\r\n\t} = settings;\r\n\tconst srcDataValue = getData(element, srcDataName);\r\n\tswitch (element.tagName) {\r\n\t\tcase \"IMG\": {\r\n\t\t\tconst parent = element.parentNode;\r\n\t\t\tconst mustChangeToWebP = supportsWebP && settings.to_webp;\r\n\t\t\tif (parent && parent.tagName === \"PICTURE\") {\r\n\t\t\t\tsetSourcesInChildren(\r\n\t\t\t\t\tparent,\r\n\t\t\t\t\t\"srcset\",\r\n\t\t\t\t\tsrcsetDataName,\r\n\t\t\t\t\tmustChangeToWebP\r\n\t\t\t\t);\r\n\t\t\t}\r\n\t\t\tconst sizesDataValue = getData(element, sizesDataName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(element, \"sizes\", sizesDataValue);\r\n\t\t\tconst srcsetDataValue = getData(element, srcsetDataName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(\r\n\t\t\t\telement,\r\n\t\t\t\t\"srcset\",\r\n\t\t\t\tsrcsetDataValue,\r\n\t\t\t\tmustChangeToWebP\r\n\t\t\t);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(\r\n\t\t\t\telement,\r\n\t\t\t\t\"src\",\r\n\t\t\t\tsrcDataValue,\r\n\t\t\t\tmustChangeToWebP\r\n\t\t\t);\r\n\t\t\tbreak;\r\n\t\t}\r\n\t\tcase \"IFRAME\":\r\n\t\t\tsetAttributeIfNotNullOrEmpty(element, \"src\", srcDataValue);\r\n\t\t\tbreak;\r\n\t\tcase \"VIDEO\":\r\n\t\t\tsetSourcesInChildren(element, \"src\", srcDataName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(element, \"src\", srcDataValue);\r\n\t\t\tbreak;\r\n\t\tdefault:\r\n\t\t\tif (srcDataValue) {\r\n\t\t\t\tlet setValue = replaceExtToWebp(srcDataValue, mustChangeToWebP);\r\n\t\t\t\telement.style.backgroundImage = `url(\"${setValue}\")`;\r\n\t\t\t}\r\n\t}\r\n};\n\nconst addClass = (element, className) => {\r\n\tif (supportsClassList) {\r\n\t\telement.classList.add(className);\r\n\t\treturn;\r\n\t}\r\n\telement.className += (element.className ? \" \" : \"\") + className;\r\n};\r\n\r\nconst removeClass = (element, className) => {\r\n\tif (supportsClassList) {\r\n\t\telement.classList.remove(className);\r\n\t\treturn;\r\n\t}\r\n\telement.className = element.className.\r\n\t\treplace(new RegExp(\"(^|\\\\s+)\" + className + \"(\\\\s+|$)\"), \" \").\r\n\t\treplace(/^\\s+/, \"\").\r\n\t\treplace(/\\s+$/, \"\");\r\n};\n\nconst callCallback = function(callback, argument) {\r\n\tif (callback) {\r\n\t\tcallback(argument);\r\n\t}\r\n};\r\n\r\nconst loadString = \"load\";\r\nconst errorString = \"error\";\r\n\r\nconst removeListeners = function(element, loadHandler, errorHandler) {\r\n\telement.removeEventListener(loadString, loadHandler);\r\n\telement.removeEventListener(errorString, errorHandler);\r\n};\r\n\r\nconst addOneShotListeners = function(element, settings) {\r\n\tconst onLoad = event => {\r\n\t\tonEvent(event, true, settings);\r\n\t\tremoveListeners(element, onLoad, onError);\r\n\t};\r\n\tconst onError = event => {\r\n\t\tonEvent(event, false, settings);\r\n\t\tremoveListeners(element, onLoad, onError);\r\n\t};\r\n\telement.addEventListener(loadString, onLoad);\r\n\telement.addEventListener(errorString, onError);\r\n};\r\n\r\nconst onEvent = function(event, success, settings) {\r\n\tconst element = event.target;\r\n\tremoveClass(element, settings.class_loading);\r\n\taddClass(element, success ? settings.class_loaded : settings.class_error); // Setting loaded or error class\r\n\tcallCallback(\r\n\t\tsuccess ? settings.callback_load : settings.callback_error,\r\n\t\telement\r\n\t);\r\n};\r\n\r\nfunction revealElement(element, settings, force) {\r\n\tif (!force && getWasProcessed(element)) {\r\n\t\treturn; // element has already been processed and force wasn't true\r\n\t}\r\n\tcallCallback(settings.callback_enter, element);\r\n\tif ([\"IMG\", \"IFRAME\", \"VIDEO\"].indexOf(element.tagName) > -1) {\r\n\t\taddOneShotListeners(element, settings);\r\n\t\taddClass(element, settings.class_loading);\r\n\t}\r\n\tsetSources(element, settings);\r\n\tsetWasProcessed(element);\r\n\tcallCallback(settings.callback_set, element);\r\n}\n\n/* entry.isIntersecting needs fallback because is null on some versions of MS Edge, and\r\n   entry.intersectionRatio is not enough alone because it could be 0 on some intersecting elements */\r\nconst isIntersecting = element =>\r\n\telement.isIntersecting || element.intersectionRatio > 0;\r\n\r\nconst getObserverSettings = settings => ({\r\n\troot: settings.container === document ? null : settings.container,\r\n\trootMargin: settings.threshold + \"px\"\r\n});\n\nconst LazyLoad = function(customSettings, elements) {\r\n\tthis._settings = getInstanceSettings(customSettings);\r\n\tthis._setObserver();\r\n\tthis.update(elements);\r\n};\r\n\r\nLazyLoad.prototype = {\r\n\t_setObserver: function() {\r\n\t\tif (!supportsIntersectionObserver) {\r\n\t\t\treturn;\r\n\t\t}\r\n\t\tconst revealIntersectingElements = entries => {\r\n\t\t\tentries.forEach(entry => {\r\n\t\t\t\tif (isIntersecting(entry)) {\r\n\t\t\t\t\tlet element = entry.target;\r\n\t\t\t\t\tthis.load(element);\r\n\t\t\t\t\tthis._observer.unobserve(element);\r\n\t\t\t\t}\r\n\t\t\t});\r\n\t\t\tthis._elements = purgeElements(this._elements);\r\n\t\t};\r\n\t\tthis._observer = new IntersectionObserver(\r\n\t\t\trevealIntersectingElements,\r\n\t\t\tgetObserverSettings(this._settings)\r\n\t\t);\r\n\t},\r\n\r\n\tloadAll: function() {\r\n\t\tthis._elements.forEach(element => {\r\n\t\t\tthis.load(element);\r\n\t\t});\r\n\t\tthis._elements = purgeElements(this._elements);\r\n\t},\r\n\r\n\tupdate: function(elements) {\r\n\t\tconst settings = this._settings;\r\n\t\tconst nodeSet =\r\n\t\t\telements ||\r\n\t\t\tsettings.container.querySelectorAll(settings.elements_selector);\r\n\r\n\t\tthis._elements = purgeElements(Array.prototype.slice.call(nodeSet)); // nodeset to array for IE compatibility\r\n\r\n\t\tif (isBot || !this._observer) {\r\n\t\t\tthis.loadAll();\r\n\t\t\treturn;\r\n\t\t}\r\n\r\n\t\tthis._elements.forEach(element => {\r\n\t\t\tthis._observer.observe(element);\r\n\t\t});\r\n\t},\r\n\r\n\tdestroy: function() {\r\n\t\tif (this._observer) {\r\n\t\t\tpurgeElements(this._elements).forEach(element => {\r\n\t\t\t\tthis._observer.unobserve(element);\r\n\t\t\t});\r\n\t\t\tthis._observer = null;\r\n\t\t}\r\n\t\tthis._elements = null;\r\n\t\tthis._settings = null;\r\n\t},\r\n\r\n\tload: function(element, force) {\r\n\t\trevealElement(element, this._settings, force);\r\n\t}\r\n};\r\n\r\n/* Automatic instances creation if required (useful for async script loading) */\r\nif (runningOnBrowser) {\r\n\tautoInitialize(LazyLoad, window.lazyLoadOptions);\r\n}\n\nreturn LazyLoad;\n\n})));\n"]}
\ No newline at end of file
diff --git a/package.json b/package.json
index c29c8538..d50cf8e3 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "vanilla-lazyload",
-	"version": "10.13.0",
+	"version": "10.14.0",
 	"description": "A fast, lightweight script to load images as they enter the viewport. SEO friendly, it supports responsive images (both srcset + sizes and picture) and progressive JPEG",
 	"main": "dist/lazyload.min.js",
 	"module": "dist/lazyload.es2015.js",

From 0eee08ce6fc33f021f8c7d13ed9b3604b4b502b8 Mon Sep 17 00:00:00 2001
From: Andrea Verlicchi <verlicchia@yoox.net>
Date: Mon, 6 Aug 2018 16:06:57 +0200
Subject: [PATCH 12/12] Bugfix for background images

---
 dist/lazyload.amd.js          | 8 ++++----
 dist/lazyload.amd.min.js      | 2 +-
 dist/lazyload.amd.min.js.map  | 2 +-
 dist/lazyload.es2015.js       | 2 +-
 dist/lazyload.iife.js         | 8 ++++----
 dist/lazyload.iife.min.js     | 2 +-
 dist/lazyload.iife.min.js.map | 2 +-
 dist/lazyload.js              | 8 ++++----
 dist/lazyload.min.js          | 2 +-
 dist/lazyload.min.js.map      | 2 +-
 src/lazyload.setSources.js    | 2 +-
 11 files changed, 20 insertions(+), 20 deletions(-)

diff --git a/dist/lazyload.amd.js b/dist/lazyload.amd.js
index fd26ac07..16b877af 100644
--- a/dist/lazyload.amd.js
+++ b/dist/lazyload.amd.js
@@ -134,19 +134,19 @@ define(function () {
 		    srcDataName = settings.data_src;
 
 		var srcDataValue = getData(element, srcDataName);
+		var mustChangeToWebP = supportsWebP && settings.to_webp;
 		switch (element.tagName) {
 			case "IMG":
 				{
 					var parent = element.parentNode;
-					var _mustChangeToWebP = supportsWebP && settings.to_webp;
 					if (parent && parent.tagName === "PICTURE") {
-						setSourcesInChildren(parent, "srcset", srcsetDataName, _mustChangeToWebP);
+						setSourcesInChildren(parent, "srcset", srcsetDataName, mustChangeToWebP);
 					}
 					var sizesDataValue = getData(element, sizesDataName);
 					setAttributeIfNotNullOrEmpty(element, "sizes", sizesDataValue);
 					var srcsetDataValue = getData(element, srcsetDataName);
-					setAttributeIfNotNullOrEmpty(element, "srcset", srcsetDataValue, _mustChangeToWebP);
-					setAttributeIfNotNullOrEmpty(element, "src", srcDataValue, _mustChangeToWebP);
+					setAttributeIfNotNullOrEmpty(element, "srcset", srcsetDataValue, mustChangeToWebP);
+					setAttributeIfNotNullOrEmpty(element, "src", srcDataValue, mustChangeToWebP);
 					break;
 				}
 			case "IFRAME":
diff --git a/dist/lazyload.amd.min.js b/dist/lazyload.amd.min.js
index 3ff67439..b30d7c19 100644
--- a/dist/lazyload.amd.min.js
+++ b/dist/lazyload.amd.min.js
@@ -1,2 +1,2 @@
-var _extends=Object.assign||function(e){for(var t=1;t<arguments.length;t++){var n=arguments[t];for(var r in n)Object.prototype.hasOwnProperty.call(n,r)&&(e[r]=n[r])}return e};define(function(){"use strict";function e(e){return e.filter(function(e){return!i(e)})}function t(e,t,n){!n&&i(e)||(p(t.callback_enter,e),["IMG","IFRAME","VIDEO"].indexOf(e.tagName)>-1&&(E(e,t),g(e,t.class_loading)),b(e,t),a(e),p(t.callback_set,e))}var n=function(e){var t={elements_selector:"img",container:document,threshold:300,data_src:"src",data_srcset:"srcset",data_sizes:"sizes",class_loading:"loading",class_loaded:"loaded",class_error:"error",callback_load:null,callback_error:null,callback_set:null,callback_enter:null,to_webp:!1};return _extends({},t,e)},r=function(e,t){return e.getAttribute("data-"+t)},s=function(e,t,n){return e.setAttribute("data-"+t,n)},a=function(e){return s(e,"was-processed","true")},i=function(e){return"true"===r(e,"was-processed")},o=function(e,t){var n,r=new e(t);try{n=new CustomEvent("LazyLoad::Initialized",{detail:{instance:r}})}catch(e){(n=document.createEvent("CustomEvent")).initCustomEvent("LazyLoad::Initialized",!1,!1,{instance:r})}window.dispatchEvent(n)},c="undefined"!=typeof window,l=c&&!("onscroll"in window)||/(gle|ing|ro)bot|crawl|spider/i.test(navigator.userAgent),u=c&&"IntersectionObserver"in window,d=c&&"classList"in document.createElement("p"),f=function(){if(!c)return!1;var e=document.createElement("canvas");return!(!e.getContext||!e.getContext("2d"))&&0===e.toDataURL("image/webp").indexOf("data:image/webp")}(),v=function(e,t,n,s){for(var a,i=0;a=e.children[i];i+=1)if("SOURCE"===a.tagName){var o=r(a,n);h(a,t,o,s)}},_=function(e,t){return t?e.replace(/\.(jpe?g|png)/gi,".webp"):e},h=function(e,t,n,r){n&&e.setAttribute(t,_(n,r))},b=function(e,t){var n=t.data_sizes,s=t.data_srcset,a=t.data_src,i=r(e,a);switch(e.tagName){case"IMG":var o=e.parentNode,c=f&&t.to_webp;o&&"PICTURE"===o.tagName&&v(o,"srcset",s,c);var l=r(e,n);h(e,"sizes",l);var u=r(e,s);h(e,"srcset",u,c),h(e,"src",i,c);break;case"IFRAME":h(e,"src",i);break;case"VIDEO":v(e,"src",a),h(e,"src",i);break;default:if(i){var d=_(i,mustChangeToWebP);e.style.backgroundImage='url("'+d+'")'}}},g=function(e,t){d?e.classList.add(t):e.className+=(e.className?" ":"")+t},m=function(e,t){d?e.classList.remove(t):e.className=e.className.replace(new RegExp("(^|\\s+)"+t+"(\\s+|$)")," ").replace(/^\s+/,"").replace(/\s+$/,"")},p=function(e,t){e&&e(t)},w=function(e,t,n){e.removeEventListener("load",t),e.removeEventListener("error",n)},E=function(e,t){var n=function n(s){y(s,!0,t),w(e,n,r)},r=function r(s){y(s,!1,t),w(e,n,r)};e.addEventListener("load",n),e.addEventListener("error",r)},y=function(e,t,n){var r=e.target;m(r,n.class_loading),g(r,t?n.class_loaded:n.class_error),p(t?n.callback_load:n.callback_error,r)},I=function(e){return e.isIntersecting||e.intersectionRatio>0},L=function(e){return{root:e.container===document?null:e.container,rootMargin:e.threshold+"px"}},O=function(e,t){this._settings=n(e),this._setObserver(),this.update(t)};return O.prototype={_setObserver:function(){var t=this;if(u){this._observer=new IntersectionObserver(function(n){n.forEach(function(e){if(I(e)){var n=e.target;t.load(n),t._observer.unobserve(n)}}),t._elements=e(t._elements)},L(this._settings))}},loadAll:function(){var t=this;this._elements.forEach(function(e){t.load(e)}),this._elements=e(this._elements)},update:function(t){var n=this,r=this._settings,s=t||r.container.querySelectorAll(r.elements_selector);this._elements=e(Array.prototype.slice.call(s)),!l&&this._observer?this._elements.forEach(function(e){n._observer.observe(e)}):this.loadAll()},destroy:function(){var t=this;this._observer&&(e(this._elements).forEach(function(e){t._observer.unobserve(e)}),this._observer=null),this._elements=null,this._settings=null},load:function(e,n){t(e,this._settings,n)}},c&&function(e,t){if(t)if(t.length)for(var n,r=0;n=t[r];r+=1)o(e,n);else o(e,t)}(O,window.lazyLoadOptions),O});
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diff --git a/dist/lazyload.amd.min.js.map b/dist/lazyload.amd.min.js.map
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document.createElement(\"canvas\");\r\n\r\n\tif (elem.getContext && elem.getContext(\"2d\")) {\r\n\t\treturn elem.toDataURL(webPString).indexOf(\"data:\" + webPString) === 0;\r\n\t}\r\n\r\n\treturn false;\r\n};\r\n\r\nconst supportsWebP = detectWebP();\n\nconst setSourcesInChildren = function(\r\n\tparentTag,\r\n\tattrName,\r\n\tdataAttrName,\r\n\ttoWebP\r\n) {\r\n\tfor (let i = 0, childTag; (childTag = parentTag.children[i]); i += 1) {\r\n\t\tif (childTag.tagName === \"SOURCE\") {\r\n\t\t\tlet attrValue = getData(childTag, dataAttrName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(childTag, attrName, attrValue, toWebP);\r\n\t\t}\r\n\t}\r\n};\r\n\r\nconst replaceExtToWebp = (value, condition) =>\r\n\tcondition ? value.replace(/\\.(jpe?g|png)/gi, \".webp\") : value;\r\n\r\nconst setAttributeIfNotNullOrEmpty = function(\r\n\telement,\r\n\tattrName,\r\n\tvalue,\r\n\ttoWebP\r\n) {\r\n\tif (!value) {\r\n\t\treturn;\r\n\t}\r\n\telement.setAttribute(attrName, replaceExtToWebp(value, 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\ No newline at end of file
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() { 'use strict';\n\nvar getInstanceSettings = customSettings => {\r\n\tconst defaultSettings = {\r\n\t\telements_selector: \"img\",\r\n\t\tcontainer: document,\r\n\t\tthreshold: 300,\r\n\t\tdata_src: \"src\",\r\n\t\tdata_srcset: \"srcset\",\r\n\t\tdata_sizes: \"sizes\",\r\n\t\tclass_loading: \"loading\",\r\n\t\tclass_loaded: \"loaded\",\r\n\t\tclass_error: \"error\",\r\n\t\tcallback_load: null,\r\n\t\tcallback_error: null,\r\n\t\tcallback_set: null,\r\n\t\tcallback_enter: null,\r\n\t\tto_webp: false\r\n\t};\r\n\r\n\treturn Object.assign({}, defaultSettings, customSettings);\r\n};\n\nconst dataPrefix = \"data-\";\r\nconst processedDataName = \"was-processed\";\r\nconst processedDataValue = \"true\";\r\n\r\nconst getData = (element, attribute) => {\r\n\treturn element.getAttribute(dataPrefix + attribute);\r\n};\r\n\r\nconst setData = (element, attribute, value) => {\r\n\treturn element.setAttribute(dataPrefix + attribute, value);\r\n};\r\n\r\nconst setWasProcessed = element =>\r\n\tsetData(element, processedDataName, processedDataValue);\r\n\r\nconst getWasProcessed = element =>\r\n\tgetData(element, processedDataName) === processedDataValue;\n\nfunction purgeElements(elements) {\r\n\treturn elements.filter(element => !getWasProcessed(element));\r\n}\n\n/* Creates instance and notifies it through the window element */\r\nconst createInstance = function(classObj, options) {\r\n\tvar event;\r\n\tlet eventString = \"LazyLoad::Initialized\";\r\n\tlet instance = new classObj(options);\r\n\ttry {\r\n\t\t// Works in modern browsers\r\n\t\tevent = new CustomEvent(eventString, { detail: { instance } });\r\n\t} catch (err) {\r\n\t\t// Works in Internet Explorer (all versions)\r\n\t\tevent = document.createEvent(\"CustomEvent\");\r\n\t\tevent.initCustomEvent(eventString, false, false, { instance });\r\n\t}\r\n\twindow.dispatchEvent(event);\r\n};\r\n\r\n/* Auto initialization of one or more instances of lazyload, depending on the \r\n    options passed in (plain object or an array) */\r\nfunction autoInitialize(classObj, options) {\r\n\tif (!options) {\r\n\t\treturn;\r\n\t}\r\n\tif (!options.length) {\r\n\t\t// Plain object\r\n\t\tcreateInstance(classObj, options);\r\n\t} else {\r\n\t\t// Array of objects\r\n\t\tfor (let i = 0, optionsItem; (optionsItem = options[i]); i += 1) {\r\n\t\t\tcreateInstance(classObj, optionsItem);\r\n\t\t}\r\n\t}\r\n}\n\nconst runningOnBrowser = typeof window !== \"undefined\";\r\n\r\nconst isBot =\r\n\t(runningOnBrowser && !(\"onscroll\" in window)) ||\r\n\t/(gle|ing|ro)bot|crawl|spider/i.test(navigator.userAgent);\r\n\r\nconst supportsIntersectionObserver =\r\n\trunningOnBrowser && \"IntersectionObserver\" in window;\r\n\r\nconst supportsClassList =\r\n\trunningOnBrowser && \"classList\" in document.createElement(\"p\");\r\n\r\nconst detectWebP = () => {\r\n\tif (!runningOnBrowser) {\r\n\t\treturn false;\r\n\t}\r\n\r\n\tvar webPString = \"image/webp\";\r\n\tvar elem = document.createElement(\"canvas\");\r\n\r\n\tif (elem.getContext && elem.getContext(\"2d\")) {\r\n\t\treturn elem.toDataURL(webPString).indexOf(\"data:\" + webPString) === 0;\r\n\t}\r\n\r\n\treturn false;\r\n};\r\n\r\nconst supportsWebP = detectWebP();\n\nconst setSourcesInChildren = function(\r\n\tparentTag,\r\n\tattrName,\r\n\tdataAttrName,\r\n\ttoWebP\r\n) {\r\n\tfor (let i = 0, childTag; (childTag = parentTag.children[i]); i += 1) {\r\n\t\tif (childTag.tagName === \"SOURCE\") {\r\n\t\t\tlet attrValue = getData(childTag, dataAttrName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(childTag, attrName, attrValue, toWebP);\r\n\t\t}\r\n\t}\r\n};\r\n\r\nconst replaceExtToWebp = (value, condition) =>\r\n\tcondition ? value.replace(/\\.(jpe?g|png)/gi, \".webp\") : value;\r\n\r\nconst setAttributeIfNotNullOrEmpty = function(\r\n\telement,\r\n\tattrName,\r\n\tvalue,\r\n\ttoWebP\r\n) {\r\n\tif (!value) {\r\n\t\treturn;\r\n\t}\r\n\telement.setAttribute(attrName, replaceExtToWebp(value, toWebP));\r\n};\r\n\r\nconst setSources = function(element, settings) {\r\n\tconst {\r\n\t\tdata_sizes: sizesDataName,\r\n\t\tdata_srcset: srcsetDataName,\r\n\t\tdata_src: srcDataName\r\n\t} = settings;\r\n\tconst srcDataValue = getData(element, srcDataName);\r\n\tconst mustChangeToWebP = supportsWebP && settings.to_webp;\r\n\tswitch (element.tagName) {\r\n\t\tcase \"IMG\": {\r\n\t\t\tconst parent = element.parentNode;\r\n\t\t\tif (parent && parent.tagName === \"PICTURE\") {\r\n\t\t\t\tsetSourcesInChildren(\r\n\t\t\t\t\tparent,\r\n\t\t\t\t\t\"srcset\",\r\n\t\t\t\t\tsrcsetDataName,\r\n\t\t\t\t\tmustChangeToWebP\r\n\t\t\t\t);\r\n\t\t\t}\r\n\t\t\tconst sizesDataValue = getData(element, sizesDataName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(element, \"sizes\", sizesDataValue);\r\n\t\t\tconst srcsetDataValue = getData(element, srcsetDataName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(\r\n\t\t\t\telement,\r\n\t\t\t\t\"srcset\",\r\n\t\t\t\tsrcsetDataValue,\r\n\t\t\t\tmustChangeToWebP\r\n\t\t\t);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(\r\n\t\t\t\telement,\r\n\t\t\t\t\"src\",\r\n\t\t\t\tsrcDataValue,\r\n\t\t\t\tmustChangeToWebP\r\n\t\t\t);\r\n\t\t\tbreak;\r\n\t\t}\r\n\t\tcase \"IFRAME\":\r\n\t\t\tsetAttributeIfNotNullOrEmpty(element, \"src\", srcDataValue);\r\n\t\t\tbreak;\r\n\t\tcase \"VIDEO\":\r\n\t\t\tsetSourcesInChildren(element, \"src\", srcDataName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(element, \"src\", srcDataValue);\r\n\t\t\tbreak;\r\n\t\tdefault:\r\n\t\t\tif (srcDataValue) {\r\n\t\t\t\tlet setValue = replaceExtToWebp(srcDataValue, mustChangeToWebP);\r\n\t\t\t\telement.style.backgroundImage = `url(\"${setValue}\")`;\r\n\t\t\t}\r\n\t}\r\n};\n\nconst addClass = (element, className) => {\r\n\tif (supportsClassList) {\r\n\t\telement.classList.add(className);\r\n\t\treturn;\r\n\t}\r\n\telement.className += (element.className ? \" \" : \"\") + className;\r\n};\r\n\r\nconst removeClass = (element, className) => {\r\n\tif (supportsClassList) {\r\n\t\telement.classList.remove(className);\r\n\t\treturn;\r\n\t}\r\n\telement.className = element.className.\r\n\t\treplace(new RegExp(\"(^|\\\\s+)\" + className + \"(\\\\s+|$)\"), \" \").\r\n\t\treplace(/^\\s+/, \"\").\r\n\t\treplace(/\\s+$/, \"\");\r\n};\n\nconst callCallback = function(callback, argument) {\r\n\tif (callback) {\r\n\t\tcallback(argument);\r\n\t}\r\n};\r\n\r\nconst loadString = \"load\";\r\nconst errorString = \"error\";\r\n\r\nconst removeListeners = function(element, loadHandler, errorHandler) {\r\n\telement.removeEventListener(loadString, loadHandler);\r\n\telement.removeEventListener(errorString, errorHandler);\r\n};\r\n\r\nconst addOneShotListeners = function(element, settings) {\r\n\tconst onLoad = event => {\r\n\t\tonEvent(event, true, settings);\r\n\t\tremoveListeners(element, onLoad, onError);\r\n\t};\r\n\tconst onError = event => {\r\n\t\tonEvent(event, false, settings);\r\n\t\tremoveListeners(element, onLoad, onError);\r\n\t};\r\n\telement.addEventListener(loadString, onLoad);\r\n\telement.addEventListener(errorString, onError);\r\n};\r\n\r\nconst onEvent = function(event, success, settings) {\r\n\tconst element = event.target;\r\n\tremoveClass(element, settings.class_loading);\r\n\taddClass(element, success ? settings.class_loaded : settings.class_error); // Setting loaded or error class\r\n\tcallCallback(\r\n\t\tsuccess ? settings.callback_load : settings.callback_error,\r\n\t\telement\r\n\t);\r\n};\r\n\r\nfunction revealElement(element, settings, force) {\r\n\tif (!force && getWasProcessed(element)) {\r\n\t\treturn; // element has already been processed and force wasn't true\r\n\t}\r\n\tcallCallback(settings.callback_enter, element);\r\n\tif ([\"IMG\", \"IFRAME\", \"VIDEO\"].indexOf(element.tagName) > -1) {\r\n\t\taddOneShotListeners(element, settings);\r\n\t\taddClass(element, settings.class_loading);\r\n\t}\r\n\tsetSources(element, settings);\r\n\tsetWasProcessed(element);\r\n\tcallCallback(settings.callback_set, element);\r\n}\n\n/* entry.isIntersecting needs fallback because is null on some versions of MS Edge, and\r\n   entry.intersectionRatio is not enough alone because it could be 0 on some intersecting elements */\r\nconst isIntersecting = element =>\r\n\telement.isIntersecting || element.intersectionRatio > 0;\r\n\r\nconst getObserverSettings = settings => ({\r\n\troot: settings.container === document ? null : settings.container,\r\n\trootMargin: settings.threshold + \"px\"\r\n});\n\nconst LazyLoad = function(customSettings, elements) {\r\n\tthis._settings = getInstanceSettings(customSettings);\r\n\tthis._setObserver();\r\n\tthis.update(elements);\r\n};\r\n\r\nLazyLoad.prototype = {\r\n\t_setObserver: function() {\r\n\t\tif (!supportsIntersectionObserver) {\r\n\t\t\treturn;\r\n\t\t}\r\n\t\tconst revealIntersectingElements = entries => {\r\n\t\t\tentries.forEach(entry => {\r\n\t\t\t\tif (isIntersecting(entry)) {\r\n\t\t\t\t\tlet element = entry.target;\r\n\t\t\t\t\tthis.load(element);\r\n\t\t\t\t\tthis._observer.unobserve(element);\r\n\t\t\t\t}\r\n\t\t\t});\r\n\t\t\tthis._elements = purgeElements(this._elements);\r\n\t\t};\r\n\t\tthis._observer = new IntersectionObserver(\r\n\t\t\trevealIntersectingElements,\r\n\t\t\tgetObserverSettings(this._settings)\r\n\t\t);\r\n\t},\r\n\r\n\tloadAll: function() {\r\n\t\tthis._elements.forEach(element => {\r\n\t\t\tthis.load(element);\r\n\t\t});\r\n\t\tthis._elements = purgeElements(this._elements);\r\n\t},\r\n\r\n\tupdate: function(elements) {\r\n\t\tconst settings = this._settings;\r\n\t\tconst nodeSet =\r\n\t\t\telements ||\r\n\t\t\tsettings.container.querySelectorAll(settings.elements_selector);\r\n\r\n\t\tthis._elements = purgeElements(Array.prototype.slice.call(nodeSet)); // nodeset to array for IE compatibility\r\n\r\n\t\tif (isBot || !this._observer) {\r\n\t\t\tthis.loadAll();\r\n\t\t\treturn;\r\n\t\t}\r\n\r\n\t\tthis._elements.forEach(element => {\r\n\t\t\tthis._observer.observe(element);\r\n\t\t});\r\n\t},\r\n\r\n\tdestroy: function() {\r\n\t\tif (this._observer) {\r\n\t\t\tpurgeElements(this._elements).forEach(element => {\r\n\t\t\t\tthis._observer.unobserve(element);\r\n\t\t\t});\r\n\t\t\tthis._observer = null;\r\n\t\t}\r\n\t\tthis._elements = null;\r\n\t\tthis._settings = null;\r\n\t},\r\n\r\n\tload: function(element, force) {\r\n\t\trevealElement(element, this._settings, force);\r\n\t}\r\n};\r\n\r\n/* Automatic instances creation if required (useful for async script loading) */\r\nif (runningOnBrowser) {\r\n\tautoInitialize(LazyLoad, window.lazyLoadOptions);\r\n}\n\nreturn LazyLoad;\n\n});\n"]}
\ No newline at end of file
diff --git a/dist/lazyload.es2015.js b/dist/lazyload.es2015.js
index 1a06446c..655cf16d 100644
--- a/dist/lazyload.es2015.js
+++ b/dist/lazyload.es2015.js
@@ -139,10 +139,10 @@ const setSources = function(element, settings) {
 		data_src: srcDataName
 	} = settings;
 	const srcDataValue = getData(element, srcDataName);
+	const mustChangeToWebP = supportsWebP && settings.to_webp;
 	switch (element.tagName) {
 		case "IMG": {
 			const parent = element.parentNode;
-			const mustChangeToWebP = supportsWebP && settings.to_webp;
 			if (parent && parent.tagName === "PICTURE") {
 				setSourcesInChildren(
 					parent,
diff --git a/dist/lazyload.iife.js b/dist/lazyload.iife.js
index 698b6e3a..88846e9e 100644
--- a/dist/lazyload.iife.js
+++ b/dist/lazyload.iife.js
@@ -134,19 +134,19 @@ var LazyLoad = function () {
 		    srcDataName = settings.data_src;
 
 		var srcDataValue = getData(element, srcDataName);
+		var mustChangeToWebP = supportsWebP && settings.to_webp;
 		switch (element.tagName) {
 			case "IMG":
 				{
 					var parent = element.parentNode;
-					var _mustChangeToWebP = supportsWebP && settings.to_webp;
 					if (parent && parent.tagName === "PICTURE") {
-						setSourcesInChildren(parent, "srcset", srcsetDataName, _mustChangeToWebP);
+						setSourcesInChildren(parent, "srcset", srcsetDataName, mustChangeToWebP);
 					}
 					var sizesDataValue = getData(element, sizesDataName);
 					setAttributeIfNotNullOrEmpty(element, "sizes", sizesDataValue);
 					var srcsetDataValue = getData(element, srcsetDataName);
-					setAttributeIfNotNullOrEmpty(element, "srcset", srcsetDataValue, _mustChangeToWebP);
-					setAttributeIfNotNullOrEmpty(element, "src", srcDataValue, _mustChangeToWebP);
+					setAttributeIfNotNullOrEmpty(element, "srcset", srcsetDataValue, mustChangeToWebP);
+					setAttributeIfNotNullOrEmpty(element, "src", srcDataValue, mustChangeToWebP);
 					break;
 				}
 			case "IFRAME":
diff --git a/dist/lazyload.iife.min.js b/dist/lazyload.iife.min.js
index ba18c7ad..d22e15d0 100644
--- a/dist/lazyload.iife.min.js
+++ b/dist/lazyload.iife.min.js
@@ -1,2 +1,2 @@
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+var _extends=Object.assign||function(e){for(var t=1;t<arguments.length;t++){var n=arguments[t];for(var r in n)Object.prototype.hasOwnProperty.call(n,r)&&(e[r]=n[r])}return e},LazyLoad=function(){"use strict";function e(e){return e.filter(function(e){return!i(e)})}function t(e,t,n){!n&&i(e)||(p(t.callback_enter,e),["IMG","IFRAME","VIDEO"].indexOf(e.tagName)>-1&&(E(e,t),g(e,t.class_loading)),b(e,t),a(e),p(t.callback_set,e))}var n=function(e){var t={elements_selector:"img",container:document,threshold:300,data_src:"src",data_srcset:"srcset",data_sizes:"sizes",class_loading:"loading",class_loaded:"loaded",class_error:"error",callback_load:null,callback_error:null,callback_set:null,callback_enter:null,to_webp:!1};return _extends({},t,e)},r=function(e,t){return e.getAttribute("data-"+t)},s=function(e,t,n){return e.setAttribute("data-"+t,n)},a=function(e){return s(e,"was-processed","true")},i=function(e){return"true"===r(e,"was-processed")},o=function(e,t){var n,r=new e(t);try{n=new CustomEvent("LazyLoad::Initialized",{detail:{instance:r}})}catch(e){(n=document.createEvent("CustomEvent")).initCustomEvent("LazyLoad::Initialized",!1,!1,{instance:r})}window.dispatchEvent(n)},c="undefined"!=typeof window,l=c&&!("onscroll"in window)||/(gle|ing|ro)bot|crawl|spider/i.test(navigator.userAgent),u=c&&"IntersectionObserver"in window,d=c&&"classList"in document.createElement("p"),f=function(){if(!c)return!1;var e=document.createElement("canvas");return!(!e.getContext||!e.getContext("2d"))&&0===e.toDataURL("image/webp").indexOf("data:image/webp")}(),v=function(e,t,n,s){for(var a,i=0;a=e.children[i];i+=1)if("SOURCE"===a.tagName){var o=r(a,n);h(a,t,o,s)}},_=function(e,t){return t?e.replace(/\.(jpe?g|png)/gi,".webp"):e},h=function(e,t,n,r){n&&e.setAttribute(t,_(n,r))},b=function(e,t){var n=t.data_sizes,s=t.data_srcset,a=t.data_src,i=r(e,a),o=f&&t.to_webp;switch(e.tagName){case"IMG":var c=e.parentNode;c&&"PICTURE"===c.tagName&&v(c,"srcset",s,o);var l=r(e,n);h(e,"sizes",l);var u=r(e,s);h(e,"srcset",u,o),h(e,"src",i,o);break;case"IFRAME":h(e,"src",i);break;case"VIDEO":v(e,"src",a),h(e,"src",i);break;default:if(i){var d=_(i,o);e.style.backgroundImage='url("'+d+'")'}}},g=function(e,t){d?e.classList.add(t):e.className+=(e.className?" ":"")+t},m=function(e,t){d?e.classList.remove(t):e.className=e.className.replace(new RegExp("(^|\\s+)"+t+"(\\s+|$)")," ").replace(/^\s+/,"").replace(/\s+$/,"")},p=function(e,t){e&&e(t)},w=function(e,t,n){e.removeEventListener("load",t),e.removeEventListener("error",n)},E=function(e,t){var n=function n(s){L(s,!0,t),w(e,n,r)},r=function r(s){L(s,!1,t),w(e,n,r)};e.addEventListener("load",n),e.addEventListener("error",r)},L=function(e,t,n){var r=e.target;m(r,n.class_loading),g(r,t?n.class_loaded:n.class_error),p(t?n.callback_load:n.callback_error,r)},y=function(e){return e.isIntersecting||e.intersectionRatio>0},I=function(e){return{root:e.container===document?null:e.container,rootMargin:e.threshold+"px"}},O=function(e,t){this._settings=n(e),this._setObserver(),this.update(t)};return O.prototype={_setObserver:function(){var t=this;if(u){this._observer=new IntersectionObserver(function(n){n.forEach(function(e){if(y(e)){var n=e.target;t.load(n),t._observer.unobserve(n)}}),t._elements=e(t._elements)},I(this._settings))}},loadAll:function(){var t=this;this._elements.forEach(function(e){t.load(e)}),this._elements=e(this._elements)},update:function(t){var n=this,r=this._settings,s=t||r.container.querySelectorAll(r.elements_selector);this._elements=e(Array.prototype.slice.call(s)),!l&&this._observer?this._elements.forEach(function(e){n._observer.observe(e)}):this.loadAll()},destroy:function(){var t=this;this._observer&&(e(this._elements).forEach(function(e){t._observer.unobserve(e)}),this._observer=null),this._elements=null,this._settings=null},load:function(e,n){t(e,this._settings,n)}},c&&function(e,t){if(t)if(t.length)for(var n,r=0;n=t[r];r+=1)o(e,n);else o(e,t)}(O,window.lazyLoadOptions),O}();
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diff --git a/dist/lazyload.iife.min.js.map b/dist/lazyload.iife.min.js.map
index caf617a3..f96be8d4 100644
--- a/dist/lazyload.iife.min.js.map
+++ b/dist/lazyload.iife.min.js.map
@@ -1 +1 @@
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LazyLoad = (function () {\n'use strict';\n\nvar getInstanceSettings = customSettings => {\r\n\tconst defaultSettings = {\r\n\t\telements_selector: \"img\",\r\n\t\tcontainer: document,\r\n\t\tthreshold: 300,\r\n\t\tdata_src: \"src\",\r\n\t\tdata_srcset: \"srcset\",\r\n\t\tdata_sizes: \"sizes\",\r\n\t\tclass_loading: \"loading\",\r\n\t\tclass_loaded: \"loaded\",\r\n\t\tclass_error: \"error\",\r\n\t\tcallback_load: null,\r\n\t\tcallback_error: null,\r\n\t\tcallback_set: null,\r\n\t\tcallback_enter: null,\r\n\t\tto_webp: false\r\n\t};\r\n\r\n\treturn Object.assign({}, defaultSettings, customSettings);\r\n};\n\nconst dataPrefix = \"data-\";\r\nconst processedDataName = \"was-processed\";\r\nconst processedDataValue = \"true\";\r\n\r\nconst getData = (element, attribute) => {\r\n\treturn element.getAttribute(dataPrefix + attribute);\r\n};\r\n\r\nconst setData = (element, attribute, value) => {\r\n\treturn element.setAttribute(dataPrefix + attribute, value);\r\n};\r\n\r\nconst setWasProcessed = element =>\r\n\tsetData(element, processedDataName, processedDataValue);\r\n\r\nconst getWasProcessed = element =>\r\n\tgetData(element, processedDataName) === processedDataValue;\n\nfunction purgeElements(elements) {\r\n\treturn elements.filter(element => !getWasProcessed(element));\r\n}\n\n/* Creates instance and notifies it through the window element */\r\nconst createInstance = function(classObj, options) {\r\n\tvar event;\r\n\tlet eventString = \"LazyLoad::Initialized\";\r\n\tlet instance = new classObj(options);\r\n\ttry {\r\n\t\t// Works in modern browsers\r\n\t\tevent = new CustomEvent(eventString, { detail: { instance } });\r\n\t} catch (err) {\r\n\t\t// Works in Internet Explorer (all versions)\r\n\t\tevent = document.createEvent(\"CustomEvent\");\r\n\t\tevent.initCustomEvent(eventString, false, false, { instance });\r\n\t}\r\n\twindow.dispatchEvent(event);\r\n};\r\n\r\n/* Auto initialization of one or more instances of lazyload, depending on the \r\n    options passed in (plain object or an array) */\r\nfunction autoInitialize(classObj, options) {\r\n\tif (!options) {\r\n\t\treturn;\r\n\t}\r\n\tif (!options.length) {\r\n\t\t// Plain object\r\n\t\tcreateInstance(classObj, options);\r\n\t} else {\r\n\t\t// Array of objects\r\n\t\tfor (let i = 0, optionsItem; (optionsItem = options[i]); i += 1) {\r\n\t\t\tcreateInstance(classObj, optionsItem);\r\n\t\t}\r\n\t}\r\n}\n\nconst runningOnBrowser = typeof window !== \"undefined\";\r\n\r\nconst isBot =\r\n\t(runningOnBrowser && !(\"onscroll\" in window)) ||\r\n\t/(gle|ing|ro)bot|crawl|spider/i.test(navigator.userAgent);\r\n\r\nconst supportsIntersectionObserver =\r\n\trunningOnBrowser && \"IntersectionObserver\" in window;\r\n\r\nconst supportsClassList =\r\n\trunningOnBrowser && \"classList\" in document.createElement(\"p\");\r\n\r\nconst detectWebP = () => {\r\n\tif (!runningOnBrowser) {\r\n\t\treturn false;\r\n\t}\r\n\r\n\tvar webPString = \"image/webp\";\r\n\tvar elem = document.createElement(\"canvas\");\r\n\r\n\tif (elem.getContext && elem.getContext(\"2d\")) {\r\n\t\treturn elem.toDataURL(webPString).indexOf(\"data:\" + webPString) === 0;\r\n\t}\r\n\r\n\treturn false;\r\n};\r\n\r\nconst supportsWebP = detectWebP();\n\nconst setSourcesInChildren = function(\r\n\tparentTag,\r\n\tattrName,\r\n\tdataAttrName,\r\n\ttoWebP\r\n) {\r\n\tfor (let i = 0, childTag; (childTag = parentTag.children[i]); i += 1) {\r\n\t\tif (childTag.tagName === \"SOURCE\") {\r\n\t\t\tlet attrValue = getData(childTag, dataAttrName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(childTag, attrName, attrValue, toWebP);\r\n\t\t}\r\n\t}\r\n};\r\n\r\nconst replaceExtToWebp = (value, condition) =>\r\n\tcondition ? value.replace(/\\.(jpe?g|png)/gi, \".webp\") : value;\r\n\r\nconst setAttributeIfNotNullOrEmpty = function(\r\n\telement,\r\n\tattrName,\r\n\tvalue,\r\n\ttoWebP\r\n) {\r\n\tif (!value) {\r\n\t\treturn;\r\n\t}\r\n\telement.setAttribute(attrName, replaceExtToWebp(value, toWebP));\r\n};\r\n\r\nconst setSources = function(element, settings) {\r\n\tconst {\r\n\t\tdata_sizes: sizesDataName,\r\n\t\tdata_srcset: srcsetDataName,\r\n\t\tdata_src: srcDataName\r\n\t} = settings;\r\n\tconst srcDataValue = getData(element, srcDataName);\r\n\tswitch (element.tagName) {\r\n\t\tcase \"IMG\": {\r\n\t\t\tconst parent = element.parentNode;\r\n\t\t\tconst mustChangeToWebP = supportsWebP && settings.to_webp;\r\n\t\t\tif (parent && parent.tagName === \"PICTURE\") {\r\n\t\t\t\tsetSourcesInChildren(\r\n\t\t\t\t\tparent,\r\n\t\t\t\t\t\"srcset\",\r\n\t\t\t\t\tsrcsetDataName,\r\n\t\t\t\t\tmustChangeToWebP\r\n\t\t\t\t);\r\n\t\t\t}\r\n\t\t\tconst sizesDataValue = getData(element, sizesDataName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(element, \"sizes\", sizesDataValue);\r\n\t\t\tconst srcsetDataValue = getData(element, srcsetDataName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(\r\n\t\t\t\telement,\r\n\t\t\t\t\"srcset\",\r\n\t\t\t\tsrcsetDataValue,\r\n\t\t\t\tmustChangeToWebP\r\n\t\t\t);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(\r\n\t\t\t\telement,\r\n\t\t\t\t\"src\",\r\n\t\t\t\tsrcDataValue,\r\n\t\t\t\tmustChangeToWebP\r\n\t\t\t);\r\n\t\t\tbreak;\r\n\t\t}\r\n\t\tcase \"IFRAME\":\r\n\t\t\tsetAttributeIfNotNullOrEmpty(element, \"src\", srcDataValue);\r\n\t\t\tbreak;\r\n\t\tcase \"VIDEO\":\r\n\t\t\tsetSourcesInChildren(element, \"src\", srcDataName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(element, \"src\", srcDataValue);\r\n\t\t\tbreak;\r\n\t\tdefault:\r\n\t\t\tif (srcDataValue) {\r\n\t\t\t\tlet setValue = replaceExtToWebp(srcDataValue, mustChangeToWebP);\r\n\t\t\t\telement.style.backgroundImage = `url(\"${setValue}\")`;\r\n\t\t\t}\r\n\t}\r\n};\n\nconst addClass = (element, className) => {\r\n\tif (supportsClassList) {\r\n\t\telement.classList.add(className);\r\n\t\treturn;\r\n\t}\r\n\telement.className += (element.className ? \" \" : \"\") + className;\r\n};\r\n\r\nconst removeClass = (element, className) => {\r\n\tif (supportsClassList) {\r\n\t\telement.classList.remove(className);\r\n\t\treturn;\r\n\t}\r\n\telement.className = element.className.\r\n\t\treplace(new RegExp(\"(^|\\\\s+)\" + className + \"(\\\\s+|$)\"), \" \").\r\n\t\treplace(/^\\s+/, \"\").\r\n\t\treplace(/\\s+$/, \"\");\r\n};\n\nconst callCallback = function(callback, argument) {\r\n\tif (callback) {\r\n\t\tcallback(argument);\r\n\t}\r\n};\r\n\r\nconst loadString = \"load\";\r\nconst errorString = \"error\";\r\n\r\nconst removeListeners = function(element, loadHandler, errorHandler) {\r\n\telement.removeEventListener(loadString, loadHandler);\r\n\telement.removeEventListener(errorString, errorHandler);\r\n};\r\n\r\nconst addOneShotListeners = function(element, settings) {\r\n\tconst onLoad = event => {\r\n\t\tonEvent(event, true, settings);\r\n\t\tremoveListeners(element, onLoad, onError);\r\n\t};\r\n\tconst onError = 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\ No newline at end of file
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= element =>\r\n\tsetData(element, processedDataName, processedDataValue);\r\n\r\nconst getWasProcessed = element =>\r\n\tgetData(element, processedDataName) === processedDataValue;\n\nfunction purgeElements(elements) {\r\n\treturn elements.filter(element => !getWasProcessed(element));\r\n}\n\n/* Creates instance and notifies it through the window element */\r\nconst createInstance = function(classObj, options) {\r\n\tvar event;\r\n\tlet eventString = \"LazyLoad::Initialized\";\r\n\tlet instance = new classObj(options);\r\n\ttry {\r\n\t\t// Works in modern browsers\r\n\t\tevent = new CustomEvent(eventString, { detail: { instance } });\r\n\t} catch (err) {\r\n\t\t// Works in Internet Explorer (all versions)\r\n\t\tevent = document.createEvent(\"CustomEvent\");\r\n\t\tevent.initCustomEvent(eventString, false, false, { instance });\r\n\t}\r\n\twindow.dispatchEvent(event);\r\n};\r\n\r\n/* Auto initialization of one or more instances of lazyload, depending on the \r\n    options passed in 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document.createElement(\"canvas\");\r\n\r\n\tif (elem.getContext && elem.getContext(\"2d\")) {\r\n\t\treturn elem.toDataURL(webPString).indexOf(\"data:\" + webPString) === 0;\r\n\t}\r\n\r\n\treturn false;\r\n};\r\n\r\nconst supportsWebP = detectWebP();\n\nconst setSourcesInChildren = function(\r\n\tparentTag,\r\n\tattrName,\r\n\tdataAttrName,\r\n\ttoWebP\r\n) {\r\n\tfor (let i = 0, childTag; (childTag = parentTag.children[i]); i += 1) {\r\n\t\tif (childTag.tagName === \"SOURCE\") {\r\n\t\t\tlet attrValue = getData(childTag, dataAttrName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(childTag, attrName, attrValue, toWebP);\r\n\t\t}\r\n\t}\r\n};\r\n\r\nconst replaceExtToWebp = (value, condition) =>\r\n\tcondition ? value.replace(/\\.(jpe?g|png)/gi, \".webp\") : value;\r\n\r\nconst setAttributeIfNotNullOrEmpty = function(\r\n\telement,\r\n\tattrName,\r\n\tvalue,\r\n\ttoWebP\r\n) {\r\n\tif (!value) {\r\n\t\treturn;\r\n\t}\r\n\telement.setAttribute(attrName, replaceExtToWebp(value, toWebP));\r\n};\r\n\r\nconst setSources = function(element, settings) {\r\n\tconst {\r\n\t\tdata_sizes: sizesDataName,\r\n\t\tdata_srcset: srcsetDataName,\r\n\t\tdata_src: srcDataName\r\n\t} = settings;\r\n\tconst srcDataValue = getData(element, srcDataName);\r\n\tconst mustChangeToWebP = supportsWebP && settings.to_webp;\r\n\tswitch (element.tagName) {\r\n\t\tcase \"IMG\": {\r\n\t\t\tconst parent = element.parentNode;\r\n\t\t\tif (parent && parent.tagName === \"PICTURE\") {\r\n\t\t\t\tsetSourcesInChildren(\r\n\t\t\t\t\tparent,\r\n\t\t\t\t\t\"srcset\",\r\n\t\t\t\t\tsrcsetDataName,\r\n\t\t\t\t\tmustChangeToWebP\r\n\t\t\t\t);\r\n\t\t\t}\r\n\t\t\tconst sizesDataValue = getData(element, sizesDataName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(element, \"sizes\", sizesDataValue);\r\n\t\t\tconst srcsetDataValue = getData(element, srcsetDataName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(\r\n\t\t\t\telement,\r\n\t\t\t\t\"srcset\",\r\n\t\t\t\tsrcsetDataValue,\r\n\t\t\t\tmustChangeToWebP\r\n\t\t\t);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(\r\n\t\t\t\telement,\r\n\t\t\t\t\"src\",\r\n\t\t\t\tsrcDataValue,\r\n\t\t\t\tmustChangeToWebP\r\n\t\t\t);\r\n\t\t\tbreak;\r\n\t\t}\r\n\t\tcase \"IFRAME\":\r\n\t\t\tsetAttributeIfNotNullOrEmpty(element, \"src\", srcDataValue);\r\n\t\t\tbreak;\r\n\t\tcase \"VIDEO\":\r\n\t\t\tsetSourcesInChildren(element, \"src\", srcDataName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(element, \"src\", srcDataValue);\r\n\t\t\tbreak;\r\n\t\tdefault:\r\n\t\t\tif (srcDataValue) {\r\n\t\t\t\tlet setValue = replaceExtToWebp(srcDataValue, mustChangeToWebP);\r\n\t\t\t\telement.style.backgroundImage = `url(\"${setValue}\")`;\r\n\t\t\t}\r\n\t}\r\n};\n\nconst addClass = (element, className) => {\r\n\tif (supportsClassList) {\r\n\t\telement.classList.add(className);\r\n\t\treturn;\r\n\t}\r\n\telement.className += (element.className ? \" \" : \"\") + className;\r\n};\r\n\r\nconst removeClass = (element, className) => {\r\n\tif (supportsClassList) {\r\n\t\telement.classList.remove(className);\r\n\t\treturn;\r\n\t}\r\n\telement.className = element.className.\r\n\t\treplace(new RegExp(\"(^|\\\\s+)\" + className + \"(\\\\s+|$)\"), \" \").\r\n\t\treplace(/^\\s+/, \"\").\r\n\t\treplace(/\\s+$/, \"\");\r\n};\n\nconst callCallback = function(callback, argument) {\r\n\tif (callback) {\r\n\t\tcallback(argument);\r\n\t}\r\n};\r\n\r\nconst loadString = \"load\";\r\nconst errorString = \"error\";\r\n\r\nconst removeListeners = function(element, loadHandler, errorHandler) {\r\n\telement.removeEventListener(loadString, loadHandler);\r\n\telement.removeEventListener(errorString, errorHandler);\r\n};\r\n\r\nconst addOneShotListeners = function(element, settings) {\r\n\tconst onLoad = event => {\r\n\t\tonEvent(event, true, settings);\r\n\t\tremoveListeners(element, onLoad, onError);\r\n\t};\r\n\tconst onError = 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settings.class_loading);\r\n\t}\r\n\tsetSources(element, settings);\r\n\tsetWasProcessed(element);\r\n\tcallCallback(settings.callback_set, element);\r\n}\n\n/* entry.isIntersecting needs fallback because is null on some versions of MS Edge, and\r\n   entry.intersectionRatio is not enough alone because it could be 0 on some intersecting elements */\r\nconst isIntersecting = element =>\r\n\telement.isIntersecting || element.intersectionRatio > 0;\r\n\r\nconst getObserverSettings = settings => ({\r\n\troot: settings.container === document ? null : settings.container,\r\n\trootMargin: settings.threshold + \"px\"\r\n});\n\nconst LazyLoad = function(customSettings, elements) {\r\n\tthis._settings = getInstanceSettings(customSettings);\r\n\tthis._setObserver();\r\n\tthis.update(elements);\r\n};\r\n\r\nLazyLoad.prototype = {\r\n\t_setObserver: function() {\r\n\t\tif (!supportsIntersectionObserver) {\r\n\t\t\treturn;\r\n\t\t}\r\n\t\tconst revealIntersectingElements = entries => {\r\n\t\t\tentries.forEach(entry => {\r\n\t\t\t\tif (isIntersecting(entry)) {\r\n\t\t\t\t\tlet element = entry.target;\r\n\t\t\t\t\tthis.load(element);\r\n\t\t\t\t\tthis._observer.unobserve(element);\r\n\t\t\t\t}\r\n\t\t\t});\r\n\t\t\tthis._elements = purgeElements(this._elements);\r\n\t\t};\r\n\t\tthis._observer = new IntersectionObserver(\r\n\t\t\trevealIntersectingElements,\r\n\t\t\tgetObserverSettings(this._settings)\r\n\t\t);\r\n\t},\r\n\r\n\tloadAll: function() {\r\n\t\tthis._elements.forEach(element => {\r\n\t\t\tthis.load(element);\r\n\t\t});\r\n\t\tthis._elements = purgeElements(this._elements);\r\n\t},\r\n\r\n\tupdate: function(elements) {\r\n\t\tconst settings = this._settings;\r\n\t\tconst nodeSet =\r\n\t\t\telements ||\r\n\t\t\tsettings.container.querySelectorAll(settings.elements_selector);\r\n\r\n\t\tthis._elements = purgeElements(Array.prototype.slice.call(nodeSet)); // nodeset to array for IE compatibility\r\n\r\n\t\tif (isBot || !this._observer) {\r\n\t\t\tthis.loadAll();\r\n\t\t\treturn;\r\n\t\t}\r\n\r\n\t\tthis._elements.forEach(element => {\r\n\t\t\tthis._observer.observe(element);\r\n\t\t});\r\n\t},\r\n\r\n\tdestroy: function() {\r\n\t\tif (this._observer) {\r\n\t\t\tpurgeElements(this._elements).forEach(element => {\r\n\t\t\t\tthis._observer.unobserve(element);\r\n\t\t\t});\r\n\t\t\tthis._observer = null;\r\n\t\t}\r\n\t\tthis._elements = null;\r\n\t\tthis._settings = null;\r\n\t},\r\n\r\n\tload: function(element, force) {\r\n\t\trevealElement(element, this._settings, force);\r\n\t}\r\n};\r\n\r\n/* Automatic instances creation if required (useful for async script loading) */\r\nif (runningOnBrowser) {\r\n\tautoInitialize(LazyLoad, window.lazyLoadOptions);\r\n}\n\nreturn LazyLoad;\n\n}());\n"]}
\ No newline at end of file
diff --git a/dist/lazyload.js b/dist/lazyload.js
index 58442980..024dd4c9 100644
--- a/dist/lazyload.js
+++ b/dist/lazyload.js
@@ -138,19 +138,19 @@ var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol
 		    srcDataName = settings.data_src;
 
 		var srcDataValue = getData(element, srcDataName);
+		var mustChangeToWebP = supportsWebP && settings.to_webp;
 		switch (element.tagName) {
 			case "IMG":
 				{
 					var parent = element.parentNode;
-					var _mustChangeToWebP = supportsWebP && settings.to_webp;
 					if (parent && parent.tagName === "PICTURE") {
-						setSourcesInChildren(parent, "srcset", srcsetDataName, _mustChangeToWebP);
+						setSourcesInChildren(parent, "srcset", srcsetDataName, mustChangeToWebP);
 					}
 					var sizesDataValue = getData(element, sizesDataName);
 					setAttributeIfNotNullOrEmpty(element, "sizes", sizesDataValue);
 					var srcsetDataValue = getData(element, srcsetDataName);
-					setAttributeIfNotNullOrEmpty(element, "srcset", srcsetDataValue, _mustChangeToWebP);
-					setAttributeIfNotNullOrEmpty(element, "src", srcDataValue, _mustChangeToWebP);
+					setAttributeIfNotNullOrEmpty(element, "srcset", srcsetDataValue, mustChangeToWebP);
+					setAttributeIfNotNullOrEmpty(element, "src", srcDataValue, mustChangeToWebP);
 					break;
 				}
 			case "IFRAME":
diff --git a/dist/lazyload.min.js b/dist/lazyload.min.js
index a63b42a3..00f4d6aa 100644
--- a/dist/lazyload.min.js
+++ b/dist/lazyload.min.js
@@ -1,2 +1,2 @@
-var _extends=Object.assign||function(e){for(var t=1;t<arguments.length;t++){var n=arguments[t];for(var r in n)Object.prototype.hasOwnProperty.call(n,r)&&(e[r]=n[r])}return e},_typeof="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e};!function(e,t){"object"===("undefined"==typeof exports?"undefined":_typeof(exports))&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):e.LazyLoad=t()}(this,function(){"use strict";function e(e){return e.filter(function(e){return!a(e)})}function t(e,t,n){!n&&a(e)||(g(t.callback_enter,e),["IMG","IFRAME","VIDEO"].indexOf(e.tagName)>-1&&(w(e,t),p(e,t.class_loading)),b(e,t),o(e),g(t.callback_set,e))}var n=function(e){var t={elements_selector:"img",container:document,threshold:300,data_src:"src",data_srcset:"srcset",data_sizes:"sizes",class_loading:"loading",class_loaded:"loaded",class_error:"error",callback_load:null,callback_error:null,callback_set:null,callback_enter:null,to_webp:!1};return _extends({},t,e)},r=function(e,t){return e.getAttribute("data-"+t)},s=function(e,t,n){return e.setAttribute("data-"+t,n)},o=function(e){return s(e,"was-processed","true")},a=function(e){return"true"===r(e,"was-processed")},i=function(e,t){var n,r=new e(t);try{n=new CustomEvent("LazyLoad::Initialized",{detail:{instance:r}})}catch(e){(n=document.createEvent("CustomEvent")).initCustomEvent("LazyLoad::Initialized",!1,!1,{instance:r})}window.dispatchEvent(n)},c="undefined"!=typeof window,l=c&&!("onscroll"in window)||/(gle|ing|ro)bot|crawl|spider/i.test(navigator.userAgent),u=c&&"IntersectionObserver"in window,d=c&&"classList"in document.createElement("p"),f=function(){if(!c)return!1;var e=document.createElement("canvas");return!(!e.getContext||!e.getContext("2d"))&&0===e.toDataURL("image/webp").indexOf("data:image/webp")}(),_=function(e,t,n,s){for(var o,a=0;o=e.children[a];a+=1)if("SOURCE"===o.tagName){var i=r(o,n);m(o,t,i,s)}},v=function(e,t){return t?e.replace(/\.(jpe?g|png)/gi,".webp"):e},m=function(e,t,n,r){n&&e.setAttribute(t,v(n,r))},b=function(e,t){var n=t.data_sizes,s=t.data_srcset,o=t.data_src,a=r(e,o);switch(e.tagName){case"IMG":var i=e.parentNode,c=f&&t.to_webp;i&&"PICTURE"===i.tagName&&_(i,"srcset",s,c);var l=r(e,n);m(e,"sizes",l);var u=r(e,s);m(e,"srcset",u,c),m(e,"src",a,c);break;case"IFRAME":m(e,"src",a);break;case"VIDEO":_(e,"src",o),m(e,"src",a);break;default:if(a){var d=v(a,mustChangeToWebP);e.style.backgroundImage='url("'+d+'")'}}},p=function(e,t){d?e.classList.add(t):e.className+=(e.className?" ":"")+t},h=function(e,t){d?e.classList.remove(t):e.className=e.className.replace(new RegExp("(^|\\s+)"+t+"(\\s+|$)")," ").replace(/^\s+/,"").replace(/\s+$/,"")},g=function(e,t){e&&e(t)},y=function(e,t,n){e.removeEventListener("load",t),e.removeEventListener("error",n)},w=function(e,t){var n=function n(s){E(s,!0,t),y(e,n,r)},r=function r(s){E(s,!1,t),y(e,n,r)};e.addEventListener("load",n),e.addEventListener("error",r)},E=function(e,t,n){var r=e.target;h(r,n.class_loading),p(r,t?n.class_loaded:n.class_error),g(t?n.callback_load:n.callback_error,r)},L=function(e){return e.isIntersecting||e.intersectionRatio>0},I=function(e){return{root:e.container===document?null:e.container,rootMargin:e.threshold+"px"}},O=function(e,t){this._settings=n(e),this._setObserver(),this.update(t)};return O.prototype={_setObserver:function(){var t=this;if(u){this._observer=new IntersectionObserver(function(n){n.forEach(function(e){if(L(e)){var n=e.target;t.load(n),t._observer.unobserve(n)}}),t._elements=e(t._elements)},I(this._settings))}},loadAll:function(){var t=this;this._elements.forEach(function(e){t.load(e)}),this._elements=e(this._elements)},update:function(t){var n=this,r=this._settings,s=t||r.container.querySelectorAll(r.elements_selector);this._elements=e(Array.prototype.slice.call(s)),!l&&this._observer?this._elements.forEach(function(e){n._observer.observe(e)}):this.loadAll()},destroy:function(){var t=this;this._observer&&(e(this._elements).forEach(function(e){t._observer.unobserve(e)}),this._observer=null),this._elements=null,this._settings=null},load:function(e,n){t(e,this._settings,n)}},c&&function(e,t){if(t)if(t.length)for(var n,r=0;n=t[r];r+=1)i(e,n);else i(e,t)}(O,window.lazyLoadOptions),O});
+var _extends=Object.assign||function(e){for(var t=1;t<arguments.length;t++){var n=arguments[t];for(var r in n)Object.prototype.hasOwnProperty.call(n,r)&&(e[r]=n[r])}return e},_typeof="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e};!function(e,t){"object"===("undefined"==typeof exports?"undefined":_typeof(exports))&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):e.LazyLoad=t()}(this,function(){"use strict";function e(e){return e.filter(function(e){return!a(e)})}function t(e,t,n){!n&&a(e)||(g(t.callback_enter,e),["IMG","IFRAME","VIDEO"].indexOf(e.tagName)>-1&&(w(e,t),p(e,t.class_loading)),b(e,t),o(e),g(t.callback_set,e))}var n=function(e){var t={elements_selector:"img",container:document,threshold:300,data_src:"src",data_srcset:"srcset",data_sizes:"sizes",class_loading:"loading",class_loaded:"loaded",class_error:"error",callback_load:null,callback_error:null,callback_set:null,callback_enter:null,to_webp:!1};return _extends({},t,e)},r=function(e,t){return e.getAttribute("data-"+t)},s=function(e,t,n){return e.setAttribute("data-"+t,n)},o=function(e){return s(e,"was-processed","true")},a=function(e){return"true"===r(e,"was-processed")},i=function(e,t){var n,r=new e(t);try{n=new CustomEvent("LazyLoad::Initialized",{detail:{instance:r}})}catch(e){(n=document.createEvent("CustomEvent")).initCustomEvent("LazyLoad::Initialized",!1,!1,{instance:r})}window.dispatchEvent(n)},c="undefined"!=typeof window,l=c&&!("onscroll"in window)||/(gle|ing|ro)bot|crawl|spider/i.test(navigator.userAgent),u=c&&"IntersectionObserver"in window,d=c&&"classList"in document.createElement("p"),f=function(){if(!c)return!1;var e=document.createElement("canvas");return!(!e.getContext||!e.getContext("2d"))&&0===e.toDataURL("image/webp").indexOf("data:image/webp")}(),_=function(e,t,n,s){for(var o,a=0;o=e.children[a];a+=1)if("SOURCE"===o.tagName){var i=r(o,n);m(o,t,i,s)}},v=function(e,t){return t?e.replace(/\.(jpe?g|png)/gi,".webp"):e},m=function(e,t,n,r){n&&e.setAttribute(t,v(n,r))},b=function(e,t){var n=t.data_sizes,s=t.data_srcset,o=t.data_src,a=r(e,o),i=f&&t.to_webp;switch(e.tagName){case"IMG":var c=e.parentNode;c&&"PICTURE"===c.tagName&&_(c,"srcset",s,i);var l=r(e,n);m(e,"sizes",l);var u=r(e,s);m(e,"srcset",u,i),m(e,"src",a,i);break;case"IFRAME":m(e,"src",a);break;case"VIDEO":_(e,"src",o),m(e,"src",a);break;default:if(a){var d=v(a,i);e.style.backgroundImage='url("'+d+'")'}}},p=function(e,t){d?e.classList.add(t):e.className+=(e.className?" ":"")+t},h=function(e,t){d?e.classList.remove(t):e.className=e.className.replace(new RegExp("(^|\\s+)"+t+"(\\s+|$)")," ").replace(/^\s+/,"").replace(/\s+$/,"")},g=function(e,t){e&&e(t)},y=function(e,t,n){e.removeEventListener("load",t),e.removeEventListener("error",n)},w=function(e,t){var n=function n(s){E(s,!0,t),y(e,n,r)},r=function r(s){E(s,!1,t),y(e,n,r)};e.addEventListener("load",n),e.addEventListener("error",r)},E=function(e,t,n){var r=e.target;h(r,n.class_loading),p(r,t?n.class_loaded:n.class_error),g(t?n.callback_load:n.callback_error,r)},L=function(e){return e.isIntersecting||e.intersectionRatio>0},I=function(e){return{root:e.container===document?null:e.container,rootMargin:e.threshold+"px"}},O=function(e,t){this._settings=n(e),this._setObserver(),this.update(t)};return O.prototype={_setObserver:function(){var t=this;if(u){this._observer=new IntersectionObserver(function(n){n.forEach(function(e){if(L(e)){var n=e.target;t.load(n),t._observer.unobserve(n)}}),t._elements=e(t._elements)},I(this._settings))}},loadAll:function(){var t=this;this._elements.forEach(function(e){t.load(e)}),this._elements=e(this._elements)},update:function(t){var n=this,r=this._settings,s=t||r.container.querySelectorAll(r.elements_selector);this._elements=e(Array.prototype.slice.call(s)),!l&&this._observer?this._elements.forEach(function(e){n._observer.observe(e)}):this.loadAll()},destroy:function(){var t=this;this._observer&&(e(this._elements).forEach(function(e){t._observer.unobserve(e)}),this._observer=null),this._elements=null,this._settings=null},load:function(e,n){t(e,this._settings,n)}},c&&function(e,t){if(t)if(t.length)for(var n,r=0;n=t[r];r+=1)i(e,n);else i(e,t)}(O,window.lazyLoadOptions),O});
 //# sourceMappingURL=lazyload.min.js.map
diff --git a/dist/lazyload.min.js.map b/dist/lazyload.min.js.map
index 4772ad12..2ed2b0b7 100644
--- a/dist/lazyload.min.js.map
+++ b/dist/lazyload.min.js.map
@@ -1 +1 @@
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(global, factory) {\n\ttypeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :\n\ttypeof define === 'function' && define.amd ? define(factory) :\n\t(global.LazyLoad = factory());\n}(this, (function () { 'use strict';\n\nvar getInstanceSettings = customSettings => {\r\n\tconst defaultSettings = {\r\n\t\telements_selector: \"img\",\r\n\t\tcontainer: document,\r\n\t\tthreshold: 300,\r\n\t\tdata_src: \"src\",\r\n\t\tdata_srcset: \"srcset\",\r\n\t\tdata_sizes: \"sizes\",\r\n\t\tclass_loading: \"loading\",\r\n\t\tclass_loaded: \"loaded\",\r\n\t\tclass_error: \"error\",\r\n\t\tcallback_load: null,\r\n\t\tcallback_error: null,\r\n\t\tcallback_set: null,\r\n\t\tcallback_enter: null,\r\n\t\tto_webp: false\r\n\t};\r\n\r\n\treturn Object.assign({}, defaultSettings, customSettings);\r\n};\n\nconst dataPrefix = \"data-\";\r\nconst processedDataName = \"was-processed\";\r\nconst processedDataValue = \"true\";\r\n\r\nconst getData = (element, attribute) => {\r\n\treturn element.getAttribute(dataPrefix + attribute);\r\n};\r\n\r\nconst setData = (element, attribute, value) => {\r\n\treturn element.setAttribute(dataPrefix + attribute, value);\r\n};\r\n\r\nconst setWasProcessed = element =>\r\n\tsetData(element, processedDataName, processedDataValue);\r\n\r\nconst getWasProcessed = element =>\r\n\tgetData(element, processedDataName) === processedDataValue;\n\nfunction purgeElements(elements) {\r\n\treturn elements.filter(element => !getWasProcessed(element));\r\n}\n\n/* Creates instance and notifies it through the window element */\r\nconst createInstance = function(classObj, options) {\r\n\tvar event;\r\n\tlet eventString = \"LazyLoad::Initialized\";\r\n\tlet instance = new classObj(options);\r\n\ttry {\r\n\t\t// Works in modern browsers\r\n\t\tevent = new CustomEvent(eventString, { detail: { instance } });\r\n\t} catch (err) {\r\n\t\t// Works in Internet Explorer (all versions)\r\n\t\tevent = document.createEvent(\"CustomEvent\");\r\n\t\tevent.initCustomEvent(eventString, false, false, { instance });\r\n\t}\r\n\twindow.dispatchEvent(event);\r\n};\r\n\r\n/* Auto initialization of one or more instances of lazyload, depending on the \r\n    options passed in (plain object or an array) */\r\nfunction autoInitialize(classObj, options) {\r\n\tif (!options) {\r\n\t\treturn;\r\n\t}\r\n\tif (!options.length) {\r\n\t\t// Plain object\r\n\t\tcreateInstance(classObj, options);\r\n\t} else {\r\n\t\t// Array of objects\r\n\t\tfor (let i = 0, optionsItem; (optionsItem = options[i]); i += 1) {\r\n\t\t\tcreateInstance(classObj, optionsItem);\r\n\t\t}\r\n\t}\r\n}\n\nconst runningOnBrowser = typeof window !== \"undefined\";\r\n\r\nconst isBot =\r\n\t(runningOnBrowser && !(\"onscroll\" in window)) ||\r\n\t/(gle|ing|ro)bot|crawl|spider/i.test(navigator.userAgent);\r\n\r\nconst supportsIntersectionObserver =\r\n\trunningOnBrowser && \"IntersectionObserver\" in window;\r\n\r\nconst supportsClassList =\r\n\trunningOnBrowser && \"classList\" in document.createElement(\"p\");\r\n\r\nconst detectWebP = () => {\r\n\tif (!runningOnBrowser) {\r\n\t\treturn false;\r\n\t}\r\n\r\n\tvar webPString = \"image/webp\";\r\n\tvar elem = document.createElement(\"canvas\");\r\n\r\n\tif (elem.getContext && elem.getContext(\"2d\")) {\r\n\t\treturn elem.toDataURL(webPString).indexOf(\"data:\" + webPString) === 0;\r\n\t}\r\n\r\n\treturn false;\r\n};\r\n\r\nconst supportsWebP = detectWebP();\n\nconst setSourcesInChildren = function(\r\n\tparentTag,\r\n\tattrName,\r\n\tdataAttrName,\r\n\ttoWebP\r\n) {\r\n\tfor (let i = 0, childTag; (childTag = parentTag.children[i]); i += 1) {\r\n\t\tif (childTag.tagName === \"SOURCE\") {\r\n\t\t\tlet attrValue = getData(childTag, dataAttrName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(childTag, attrName, attrValue, toWebP);\r\n\t\t}\r\n\t}\r\n};\r\n\r\nconst replaceExtToWebp = (value, condition) =>\r\n\tcondition ? value.replace(/\\.(jpe?g|png)/gi, \".webp\") : value;\r\n\r\nconst setAttributeIfNotNullOrEmpty = function(\r\n\telement,\r\n\tattrName,\r\n\tvalue,\r\n\ttoWebP\r\n) {\r\n\tif (!value) {\r\n\t\treturn;\r\n\t}\r\n\telement.setAttribute(attrName, replaceExtToWebp(value, toWebP));\r\n};\r\n\r\nconst setSources = function(element, settings) {\r\n\tconst {\r\n\t\tdata_sizes: sizesDataName,\r\n\t\tdata_srcset: srcsetDataName,\r\n\t\tdata_src: srcDataName\r\n\t} = settings;\r\n\tconst srcDataValue = getData(element, srcDataName);\r\n\tswitch (element.tagName) {\r\n\t\tcase \"IMG\": {\r\n\t\t\tconst parent = element.parentNode;\r\n\t\t\tconst mustChangeToWebP = supportsWebP && settings.to_webp;\r\n\t\t\tif (parent && parent.tagName === \"PICTURE\") {\r\n\t\t\t\tsetSourcesInChildren(\r\n\t\t\t\t\tparent,\r\n\t\t\t\t\t\"srcset\",\r\n\t\t\t\t\tsrcsetDataName,\r\n\t\t\t\t\tmustChangeToWebP\r\n\t\t\t\t);\r\n\t\t\t}\r\n\t\t\tconst sizesDataValue = getData(element, sizesDataName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(element, \"sizes\", sizesDataValue);\r\n\t\t\tconst srcsetDataValue = getData(element, srcsetDataName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(\r\n\t\t\t\telement,\r\n\t\t\t\t\"srcset\",\r\n\t\t\t\tsrcsetDataValue,\r\n\t\t\t\tmustChangeToWebP\r\n\t\t\t);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(\r\n\t\t\t\telement,\r\n\t\t\t\t\"src\",\r\n\t\t\t\tsrcDataValue,\r\n\t\t\t\tmustChangeToWebP\r\n\t\t\t);\r\n\t\t\tbreak;\r\n\t\t}\r\n\t\tcase \"IFRAME\":\r\n\t\t\tsetAttributeIfNotNullOrEmpty(element, \"src\", srcDataValue);\r\n\t\t\tbreak;\r\n\t\tcase \"VIDEO\":\r\n\t\t\tsetSourcesInChildren(element, \"src\", srcDataName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(element, \"src\", srcDataValue);\r\n\t\t\tbreak;\r\n\t\tdefault:\r\n\t\t\tif (srcDataValue) {\r\n\t\t\t\tlet setValue = replaceExtToWebp(srcDataValue, mustChangeToWebP);\r\n\t\t\t\telement.style.backgroundImage = `url(\"${setValue}\")`;\r\n\t\t\t}\r\n\t}\r\n};\n\nconst addClass = (element, className) => {\r\n\tif (supportsClassList) {\r\n\t\telement.classList.add(className);\r\n\t\treturn;\r\n\t}\r\n\telement.className += (element.className ? \" \" : \"\") + className;\r\n};\r\n\r\nconst removeClass = (element, className) => {\r\n\tif (supportsClassList) {\r\n\t\telement.classList.remove(className);\r\n\t\treturn;\r\n\t}\r\n\telement.className = element.className.\r\n\t\treplace(new RegExp(\"(^|\\\\s+)\" + className + \"(\\\\s+|$)\"), \" \").\r\n\t\treplace(/^\\s+/, \"\").\r\n\t\treplace(/\\s+$/, \"\");\r\n};\n\nconst callCallback = function(callback, argument) {\r\n\tif (callback) {\r\n\t\tcallback(argument);\r\n\t}\r\n};\r\n\r\nconst loadString = \"load\";\r\nconst errorString = \"error\";\r\n\r\nconst removeListeners = function(element, loadHandler, errorHandler) {\r\n\telement.removeEventListener(loadString, loadHandler);\r\n\telement.removeEventListener(errorString, errorHandler);\r\n};\r\n\r\nconst addOneShotListeners = function(element, settings) {\r\n\tconst onLoad = event => {\r\n\t\tonEvent(event, true, settings);\r\n\t\tremoveListeners(element, onLoad, onError);\r\n\t};\r\n\tconst onError = event => {\r\n\t\tonEvent(event, false, settings);\r\n\t\tremoveListeners(element, onLoad, onError);\r\n\t};\r\n\telement.addEventListener(loadString, onLoad);\r\n\telement.addEventListener(errorString, onError);\r\n};\r\n\r\nconst onEvent = function(event, success, settings) {\r\n\tconst element = event.target;\r\n\tremoveClass(element, settings.class_loading);\r\n\taddClass(element, success ? settings.class_loaded : settings.class_error); // Setting loaded or error class\r\n\tcallCallback(\r\n\t\tsuccess ? settings.callback_load : settings.callback_error,\r\n\t\telement\r\n\t);\r\n};\r\n\r\nfunction revealElement(element, settings, force) {\r\n\tif (!force && getWasProcessed(element)) {\r\n\t\treturn; // element has already been processed and force wasn't true\r\n\t}\r\n\tcallCallback(settings.callback_enter, element);\r\n\tif ([\"IMG\", \"IFRAME\", \"VIDEO\"].indexOf(element.tagName) > -1) {\r\n\t\taddOneShotListeners(element, settings);\r\n\t\taddClass(element, settings.class_loading);\r\n\t}\r\n\tsetSources(element, settings);\r\n\tsetWasProcessed(element);\r\n\tcallCallback(settings.callback_set, element);\r\n}\n\n/* entry.isIntersecting needs fallback because is null on some versions of MS Edge, and\r\n   entry.intersectionRatio is not enough alone because it could be 0 on some intersecting elements */\r\nconst isIntersecting = element =>\r\n\telement.isIntersecting || element.intersectionRatio > 0;\r\n\r\nconst getObserverSettings = settings => ({\r\n\troot: settings.container === document ? null : settings.container,\r\n\trootMargin: settings.threshold + \"px\"\r\n});\n\nconst LazyLoad = function(customSettings, elements) {\r\n\tthis._settings = getInstanceSettings(customSettings);\r\n\tthis._setObserver();\r\n\tthis.update(elements);\r\n};\r\n\r\nLazyLoad.prototype = {\r\n\t_setObserver: function() {\r\n\t\tif (!supportsIntersectionObserver) 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\ No newline at end of file
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\".webp\") : value;\r\n\r\nconst setAttributeIfNotNullOrEmpty = function(\r\n\telement,\r\n\tattrName,\r\n\tvalue,\r\n\ttoWebP\r\n) {\r\n\tif (!value) {\r\n\t\treturn;\r\n\t}\r\n\telement.setAttribute(attrName, replaceExtToWebp(value, toWebP));\r\n};\r\n\r\nconst setSources = function(element, settings) {\r\n\tconst {\r\n\t\tdata_sizes: sizesDataName,\r\n\t\tdata_srcset: srcsetDataName,\r\n\t\tdata_src: srcDataName\r\n\t} = settings;\r\n\tconst srcDataValue = getData(element, srcDataName);\r\n\tconst mustChangeToWebP = supportsWebP && settings.to_webp;\r\n\tswitch (element.tagName) {\r\n\t\tcase \"IMG\": {\r\n\t\t\tconst parent = element.parentNode;\r\n\t\t\tif (parent && parent.tagName === \"PICTURE\") {\r\n\t\t\t\tsetSourcesInChildren(\r\n\t\t\t\t\tparent,\r\n\t\t\t\t\t\"srcset\",\r\n\t\t\t\t\tsrcsetDataName,\r\n\t\t\t\t\tmustChangeToWebP\r\n\t\t\t\t);\r\n\t\t\t}\r\n\t\t\tconst sizesDataValue = getData(element, sizesDataName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(element, \"sizes\", sizesDataValue);\r\n\t\t\tconst srcsetDataValue = getData(element, srcsetDataName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(\r\n\t\t\t\telement,\r\n\t\t\t\t\"srcset\",\r\n\t\t\t\tsrcsetDataValue,\r\n\t\t\t\tmustChangeToWebP\r\n\t\t\t);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(\r\n\t\t\t\telement,\r\n\t\t\t\t\"src\",\r\n\t\t\t\tsrcDataValue,\r\n\t\t\t\tmustChangeToWebP\r\n\t\t\t);\r\n\t\t\tbreak;\r\n\t\t}\r\n\t\tcase \"IFRAME\":\r\n\t\t\tsetAttributeIfNotNullOrEmpty(element, \"src\", srcDataValue);\r\n\t\t\tbreak;\r\n\t\tcase \"VIDEO\":\r\n\t\t\tsetSourcesInChildren(element, \"src\", srcDataName);\r\n\t\t\tsetAttributeIfNotNullOrEmpty(element, \"src\", srcDataValue);\r\n\t\t\tbreak;\r\n\t\tdefault:\r\n\t\t\tif (srcDataValue) {\r\n\t\t\t\tlet setValue = replaceExtToWebp(srcDataValue, mustChangeToWebP);\r\n\t\t\t\telement.style.backgroundImage = `url(\"${setValue}\")`;\r\n\t\t\t}\r\n\t}\r\n};\n\nconst addClass = (element, className) => {\r\n\tif (supportsClassList) 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settings);\r\n\t\tremoveListeners(element, onLoad, onError);\r\n\t};\r\n\tconst onError = event => {\r\n\t\tonEvent(event, false, settings);\r\n\t\tremoveListeners(element, onLoad, onError);\r\n\t};\r\n\telement.addEventListener(loadString, onLoad);\r\n\telement.addEventListener(errorString, onError);\r\n};\r\n\r\nconst onEvent = function(event, success, settings) {\r\n\tconst element = event.target;\r\n\tremoveClass(element, settings.class_loading);\r\n\taddClass(element, success ? settings.class_loaded : settings.class_error); // Setting loaded or error class\r\n\tcallCallback(\r\n\t\tsuccess ? settings.callback_load : settings.callback_error,\r\n\t\telement\r\n\t);\r\n};\r\n\r\nfunction revealElement(element, settings, force) {\r\n\tif (!force && getWasProcessed(element)) {\r\n\t\treturn; // element has already been processed and force wasn't true\r\n\t}\r\n\tcallCallback(settings.callback_enter, element);\r\n\tif ([\"IMG\", \"IFRAME\", \"VIDEO\"].indexOf(element.tagName) > -1) {\r\n\t\taddOneShotListeners(element, settings);\r\n\t\taddClass(element, settings.class_loading);\r\n\t}\r\n\tsetSources(element, settings);\r\n\tsetWasProcessed(element);\r\n\tcallCallback(settings.callback_set, element);\r\n}\n\n/* entry.isIntersecting needs fallback because is null on some versions of MS Edge, and\r\n   entry.intersectionRatio is not enough alone because it could be 0 on some intersecting elements */\r\nconst isIntersecting = element =>\r\n\telement.isIntersecting || element.intersectionRatio > 0;\r\n\r\nconst getObserverSettings = settings => ({\r\n\troot: settings.container === document ? null : settings.container,\r\n\trootMargin: settings.threshold + \"px\"\r\n});\n\nconst LazyLoad = function(customSettings, elements) {\r\n\tthis._settings = getInstanceSettings(customSettings);\r\n\tthis._setObserver();\r\n\tthis.update(elements);\r\n};\r\n\r\nLazyLoad.prototype = {\r\n\t_setObserver: function() {\r\n\t\tif (!supportsIntersectionObserver) {\r\n\t\t\treturn;\r\n\t\t}\r\n\t\tconst revealIntersectingElements = entries => {\r\n\t\t\tentries.forEach(entry => {\r\n\t\t\t\tif (isIntersecting(entry)) {\r\n\t\t\t\t\tlet element = entry.target;\r\n\t\t\t\t\tthis.load(element);\r\n\t\t\t\t\tthis._observer.unobserve(element);\r\n\t\t\t\t}\r\n\t\t\t});\r\n\t\t\tthis._elements = purgeElements(this._elements);\r\n\t\t};\r\n\t\tthis._observer = new IntersectionObserver(\r\n\t\t\trevealIntersectingElements,\r\n\t\t\tgetObserverSettings(this._settings)\r\n\t\t);\r\n\t},\r\n\r\n\tloadAll: function() {\r\n\t\tthis._elements.forEach(element => {\r\n\t\t\tthis.load(element);\r\n\t\t});\r\n\t\tthis._elements = purgeElements(this._elements);\r\n\t},\r\n\r\n\tupdate: function(elements) {\r\n\t\tconst settings = this._settings;\r\n\t\tconst nodeSet =\r\n\t\t\telements ||\r\n\t\t\tsettings.container.querySelectorAll(settings.elements_selector);\r\n\r\n\t\tthis._elements = purgeElements(Array.prototype.slice.call(nodeSet)); // nodeset to array for IE compatibility\r\n\r\n\t\tif (isBot || !this._observer) {\r\n\t\t\tthis.loadAll();\r\n\t\t\treturn;\r\n\t\t}\r\n\r\n\t\tthis._elements.forEach(element => {\r\n\t\t\tthis._observer.observe(element);\r\n\t\t});\r\n\t},\r\n\r\n\tdestroy: function() {\r\n\t\tif (this._observer) {\r\n\t\t\tpurgeElements(this._elements).forEach(element => {\r\n\t\t\t\tthis._observer.unobserve(element);\r\n\t\t\t});\r\n\t\t\tthis._observer = null;\r\n\t\t}\r\n\t\tthis._elements = null;\r\n\t\tthis._settings = null;\r\n\t},\r\n\r\n\tload: function(element, force) {\r\n\t\trevealElement(element, this._settings, force);\r\n\t}\r\n};\r\n\r\n/* Automatic instances creation if required (useful for async script loading) */\r\nif (runningOnBrowser) {\r\n\tautoInitialize(LazyLoad, window.lazyLoadOptions);\r\n}\n\nreturn LazyLoad;\n\n})));\n"]}
\ No newline at end of file
diff --git a/src/lazyload.setSources.js b/src/lazyload.setSources.js
index 8648573e..2101c13a 100644
--- a/src/lazyload.setSources.js
+++ b/src/lazyload.setSources.js
@@ -37,10 +37,10 @@ export const setSources = function(element, settings) {
 		data_src: srcDataName
 	} = settings;
 	const srcDataValue = getData(element, srcDataName);
+	const mustChangeToWebP = supportsWebP && settings.to_webp;
 	switch (element.tagName) {
 		case "IMG": {
 			const parent = element.parentNode;
-			const mustChangeToWebP = supportsWebP && settings.to_webp;
 			if (parent && parent.tagName === "PICTURE") {
 				setSourcesInChildren(
 					parent,
