Reference
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HTML5 Readiness
Visual timeline of HTML5 feature support.
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When Can I Use...
Up to date HTML5 feature browser support reference.
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HTML5 Test
Series of browser tests to evaluate feature support.
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Chrome Implementation Status
Follow the engineering effort for cutting edge support from the Chrome team.
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Web specifications support in Opera Presto 2.10
Opera's support for HTML5 standards
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HTML5: Comparison of Layout Engines
If the Wikipedia says it then it must be true.
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ECMAScript 5 table
Detailed table of ES5 support across browsers.
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Compatibility Tables
Results of DOM and CSS properties tests in major browsers.
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HTML5 Demos
html5demos.com is a demo site with cross-browser demos.
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HTML5-Demos
html5-demos.com is another demo site with cutting-edge demos and slide decks.
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Field Guide to Web Applications
A guide to help developers build great web applications.
Documentation
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WHATWG HTML5 for Developers
WHATWG HTML5 Spec, only author info preserved. Perfect for web developers.
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Dive into HTML5 by Mark Pilgrim
Learn HTML5 and have a laugh at the same time.
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Safari HTML5 Guides
Excellent WebKit-oriented development documentation.
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Mozilla Development Center HTML5 Reference
Excellent documentation and guides.
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WhatWG Web Apps Spec (HTML5 plus the kitchen sink)
Working draft spec of everything under the larger HTML5 umbrella.
Tools
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Modernizr
Javascript library for feature detection and control fallback cases of HTML5.
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html5 shiv
Javascript patch to make IE support, and print, the new tag elements.
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HTML5 Boilerplate
An set of HTML/CSS/JS templates with best practices for HTML5 and front-end dev built in.
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HTML5 Cross-browser Polyfills
The collection of scripts that enable HTML5 features in all browsers.
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CSS Button Maker
Preview CSS buttons with a fancy interface to play with the parameters.
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CSS3 Generator
Preview CSS buttons with a fancy interface to play with the parameters.
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CSS3 Sandbox
Test and get the code of the fanciest CSS features.
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CSS3 Gradient Generator
Generate CSS code for gradients on the fly.
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CSS3 Please
Use CSS3 without having to worry about xbrowser differences.
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Font Dragr
Test your fonts using drag and drop.
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Font Squirrel Generator
Most complete tool to generate code for you font-face support.
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Let's make the web faster
Complete list of tools related to web performance.
project.
HTML5 Doctor
WhatWG Blog
Chromium HTML5 Discussion Group
Mozilla Hacks
Safari HTML5 Demos
Internet Explorer Test Drive
Open Web - Opera Developer Community
Chrome Experiments
Using the HTML5 Filesystem API [Eric Bidelman]
HTML5 [Mark Pilgrim]
Pro HTML5 Programming [Peter Lubbers, Brian Albers, Frank Salim]
Introducing HTML5 [Bruce Lawson, Remy Sharp]
HTML5 For Web Designers [Jeremy Keith]
HTML5 Now [Tantek Celik]