Platform Support

Readium CSS should support the following:

• iOS 9+
• Android 5+
• macOS 10.9+
• Win 10+

Which can be mapped to the following default or popular browsers:

• Safari 9
• Chrome (latest 2)
• MS Edge (latest 2)
• Firefox (latest 2)

And the following web views:

• WKWebView (iOS, new UI kit)
• ChromeView (Android, new UI kit)

Other browsers we might want to take into account:

• UC Browser for Android (latest)
• Samsung Internet (latest)

Unsupported browsers

• IE11
• Browsers which don’t support CSS custom properties (a.k.a. CSS variables)

Most of ReadiumCSS should work if you build stylesheets into a static representation (see PostCSS in docs) but user settings won’t. So you’ll have to implement settings in JS.