What support do various browsers have for HTML 5?

Check this site for an excellent set of tables on Web browser HTML support: Browser support for HTML.

The answer is difficult because HTML 5 is still not finished and many browsers today have partial support of some of the HTML 5 features, like:

• Canvas element
• Offline storage
• Appcache
• audio and video tags
• New tags for content
• W3C Geolocation API

You will find partial support in Firefox 3.5 (Canvas was already in previous version), Chrome 4.0, Safari 4 and in many mobile browsers. It is suppoused that Internet Explorer 9 will bring some of these features, but Microsoft didn't confirm that. Mobile browsers started to push the usage of HTML 5. You will find partial support in Mobile Safari (iPhone and iPod Touch), Android 2.0 (previous versions have similar funcionalities using Google Gears), Palm WebOS browser.

Wikipedia has a good chart based on the rendering engine (including which browsers use which engine) including which elements each one supports.

wikipedia - HTML5 support per rendering engine

This website rates HTML5 support of various browsers - http://html5test.com/

When you open the site in a browser, it detects that browser & assigns a score based on how well that browser supports the upcoming HTML5 standard and related specifications. It also shows the specific features that are supported.

The score is calculated by testing for the many new features of HTML5.

It does not try to test all of the new features offered by HTML5, nor does it try to test the functionality of each feature it does detect.

The latest versions of Chrome & Safari score better than current versions of Firefox & IE. You can track IE9's support of HTML5 here - http://samples.msdn....stcenter/#html5