This is mostly for personal reference, but here is an ongoing list of HTML5 resources, tutorials, samples, tools, validators and resources. Please let me know if you would like anything added to this list. Enjoy!
HTML5 Documentation:
- Differences between HTML4 and HTML5 – http://dev.w3.org/html5/html4-differences/
- WHATWG and HTML5 FAQ - http://wiki.whatwg.org/wiki/FAQ
- WHATWG web developer-friendly spec - http://developers.whatwg.org/
- Dive into HTML5, specific HTML5 feature esamples - http://diveintohtml5.org/
- HTML5 editor’s spec overview - http://dev.w3.org/html5/spec/Overview.html
- Latest HTML5 published version - http://www.w3.org/TR/html5/
- HTML5 Spec, web author edition - http://www.w3.org/TR/html5/author/
- HTML5 tag reference - http://www.w3schools.com/html5/html5_reference.asp
- HTML5 doctor (implementation help) - http://html5doctor.com/
- Mozilla Gecko engine HTML5 support (Firefox) - https://developer.mozilla.org/en/html/html5
- HTML5 pocketbook reference - http://adactio.com/extras/pocketbooks/html5/
HTML5 Tutorials:
- W3Schools HTML5 tutorial - https://developer.mozilla.org/en/html/html5
- HTML5 preview (structural example) - http://www.alistapart.com/articles/previewofhtml5
- HTML5 tutorials and related topics - http://html5tutorial.net/
- HTML5 canvas tutorials - http://www.html5canvastutorials.com/
- HTML5 video tutorials lynda.com - http://www.lynda.com/HTML-5-tutorials/html5-first-look/67161-2.html
- HTML5 Unleashed: Tips, Tricks & Techniques - http://www.w3avenue.com/2010/05/07/html5-unleashed-tips-tricks-and-techniques/
HTML5 Samples:
- HTML5 Rocks: code playground, sample portfolio, tutorials - http://www.html5rocks.com/en/
- HTML5 demos and examples - http://html5demos.com/
- Apple HTML5/CSS3 demos (view in latest version of Safari) - http://www.apple.com/html5/
- HTML5 showcase - http://html5gallery.com/
- Mozilla HTML5 dashboard - https://mozillademos.org/demos/dashboard/demo.html
- HTML5 games portfolio - http://html5games.com/
- Classic game: Helicopter - http://arandomurl.com/2010/08/05/html5-helicopter.html
HTML5 Tools:
- Test your browser’s HTML5 support - http://html5test.com/
- The HTML5 boilerplate (a codebase for HTML5 projects) - http://html5boilerplate.com/
- HTML5 and CSS3 readiness (up to date browser support) - http://html5readiness.com/
- HTML5 reset tools - http://html5reset.org/
- Using HTML5 in mobile web development - http://www.mobilehtml5.com/
- HTML5 browser support for various features - http://findmebyip.com/litmus/
- HTML5 accessibility resources (assistive technology access) - http://html5accessibility.com/
- HTML5 Initializr, start an HTML5 project in 15 seconds - http://initializr.com/
- HTML5 security cheatsheet - http://html5sec.org/
- Improving your froms with HTML5 - http://dev.opera.com/articles/view/improve-your-forms-using-html5/
- HTML5 canvas cheat sheet - http://simon.html5.org/dump/html5-canvas-cheat-sheet.html
- HTML5shiv - http://code.google.com/p/html5shiv/
- HTML5 video comparison - http://praegnanz.de/html5video/
- Paul Irish HTML5 boilerplate - https://github.com/paulirish/html5-boilerplate
- MediaElements.js HTML5 video - http://mediaelementjs.com/
- HTML5 authoring tools - http://www.html5trends.com/best-of/6-html5-authoring-tools/
- HTML5 form additions - http://thinkvitamin.com/code/fun-with-html5-forms/
- HTML5 Cheatsheet - http://woork.blogspot.com/2009/09/html-5-visual-cheat-sheet-by-woork.html
- HTML5 canvas cheatsheet - http://blog.nihilogic.dk/2009/02/html5-canvas-cheat-sheet.html
HTML5 Commentaries:
- HTML5 vs. Flash - http://remysharp.com/2010/02/08/html5-vs-flash/
- Silverlight, HTML5 & Microsoft’s Opaque Development Strategy - http://arstechnica.com/microsoft/news/2010/11/silverlight-html5-and-microsofts-opaque-development-strategy.ars
HTML5 Validators:
- HTML5 Validator (experimental) - http://html5.validator.nu/
- The W3C markup validator - http://validator.w3.org/
- The WHATWG HTML5 validator - http://validator.whatwg.org/
- Validator.nu HTML5 validation extension for Firefox - http://www.456bereastreet.com/archive/201102/html5_validator_extension_updates/
- HTML5 validator bookmarklet - http://nuevvo.com/labs/html5-validator-bookmarklet/
- HTML5 validator Firefox add-on - https://addons.mozilla.org/en-US/firefox/addon/html-5-validator/
- HTML linting tool - http://lint.brihten.com/html/
HTML5 Trackers:
- HTML5.org SVN & bug tracking - http://html5.org/tools/web-apps-tracker
HTML5 Books:
- Introducing HTML5, by Bruce Lawson and Remy Sharp - http://introducinghtml5.com/
Other Resources:
- Follow HTML5 updates on Twitter - http://twitter.com/#!/html5
- The official HTML5 logo and swag - http://www.w3.org/html/logo/#swag
- Is HTML5 ready yet? (view source code :) - http://ishtml5readyyet.com/