Browser compatibility

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Firefox 4 will come with better support for HTML5 forms. https://hacks.mozilla.org/2010/11/firefox-4-html5-forms/

Firefox 4: HTML5 Forms

http://hsivonen.iki.fi/doctype/

Activating Browser Modes with Doctype

In order to deal both with content written according to Web standards and with content written according to legacy practices that were prevalent in the late 1990s, today’s Web browsers implement various engine modes.

Ultimate IE6 Cheatsheet: How To Fix 25+ Internet Explorer 6 Bugs

The best strategy for dealing with Internet Explorer 6 is not to support it. Stop. Ok, I feel your frustration. http://www.virtuosimedia.com/dev/css/ultimate-ie6-cheatsheet-how-to-fix-25-internet-explorer-6-bugs