Guru is a javascript to lint html in the browser using css selectors based on an article by bitsofco.de. This way, you're not dependent on browserspecific plugins or other third-party tools to verify your website.
To add guru to your website just add the following line to your html:
<script type="text/javascript" src="/path_to/guru.js"></script>
This is only the beginning...
- Add a way to disable/enable the linter without removing the script-tag
- Disable/enable specific rules
- Add more rules to check
- Implement a 404 scanner