Custom Font Support for UI Browser and Websites

[SwiftyPop]

Description

This feature request proposes adding the ability to customize fonts in the UI browser and on websites, similar to the functionality offered by the Chrome extension Fontonic. The implementation should allow users to:

1. Globally apply custom font that overrides website-specific fonts for all sites.
2. Assign specific fonts to individual websites while maintaining a global default font for others.
3. Exclusion options for specify websites where the global font settings will not apply.

How it should be implemented?

Since Android lacks a standard method to install and use custom .ttf fonts universally across apps and browsers, the following approach is suggested:

1. Custom Font Selection

   • Implement a system similar to Moon+ Reader, where the app lists all system-installed fonts and allows users to independently add and select custom .ttf fonts without requiring OS-level font installation.
     • A file picker to allow users to upload custom .ttf fonts.

2. User-Friendly Settings Interface

   • Provide settings for managing global and per-site font preferences.
   • Enable an option to exclude specific websites from global font settings.

Example

Below is an example of the requested functionality as implemented in the Fontonic extension on Chrome for Windows:

• Left: Custom font "Bookerly" applied.
• Right: Custom font "Atkinson Hyperlegible" applied.
  

Why this should be implemented?

This feature provides both aesthetic and functional benefits. It caters to users with specific font preferences or visual impairments by allowing customization for improved readability. Fonts like Atkinson Hyperlegible, for example, enhance reading speed and comprehension due to their high legibility.