These compatibility tables detail support for the new HTML5 functionalities in all modern browsers. They concentrate on actual HTML tags; not on CSS or JavaScript.
| Input types | date,number,email, and related. | 2.1 | 2.1.1 | 
| Responsive images | The four types of responsive images. | 2.3 | - | 
The last columns state the desktop and mobile browser test array versions I used.
| Feature | IE 9 | FF 4.0b11 | Saf 5 | Chrome 9 | Opera 11 | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| video | H.264 | WebM and Ogg | H.264 | All | WebM and Ogg | |||||||||||||||||||
| Local storage Details | Yes | Yes | Yes | Yes | Yes | |||||||||||||||||||
| I last tested this back in 2009. All modern browsers support at least the basics. I have to do a thorough retest of the dirty details, though. | ||||||||||||||||||||||||