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css3

CSS3 & HTML5 Browser Support
HTML5 & CSS3 Support, Web Design Tools & Support
CSS3 Introduction
Free HTML XHTML CSS JavaScript jQuery XML DOM XSL XSLT RSS AJAX ASP .NET PHP SQL tutorials, references, examples for web building.
@font-face tutorial and user guide by Milton Bayer
Google Web Fonts
Default HTML 4 style sheet
Selectivizr - CSS3 pseudo-class and attribute selectors for IE 6-8
selectivizr is a JavaScript utility that emulates CSS3 selectors in Internet Explorer 6-8

reference

Current browser HTML5 test
HTML5 Tag Reference
Free HTML XHTML CSS JavaScript jQuery XML DOM XSL XSLT RSS AJAX ASP .NET PHP SQL tutorials, references, examples for web building.
HTML5 Spec - W3C

tools

HTML 5 Outliner
HTML5 Validator
HTML5 CSS enabling script
Style Master CSS Editor for Windows and Mac OS X
CSS Editor with WYSIWYG editing, Wizards and hand coding tools for Windows and Mac OS X
Ultimate CSS Gradient Generator - ColorZilla.com
A powerful Photoshop-like CSS gradient editor

aria

Paciello Group - HTML 5 WAI aria
Introduction to WAI ARIA
Dev.Opera article: Introduction to WAI ARIA
WAI aria spec - W3C