HTML5Plase.us : “Use the new and shiny responsibly.”
HTML5Please is a newly launched website that enables developer to look up HTML5 & CSS3 features to know if they are ready for use in your actual project. This reference site represent the collective knowledge of developers who have been deep in the HTML5 trenches, to be exact, created as a community project by the people behind HTML5 Boilerplate, Modernizr and CSS3 Please!.
HTML5Please provides comprehensive & straightforward guidance for each element and property, with colored flags and information regarding browser support, including for IE10+, IE9, IE8, IE7, and non-IE browsers.
It also helps you out with recommendations for polyfills and implementation so you can decide if and how to put each of these features to use. An integrated filter enables you to rapidly refine your search to just the features you’re interested in.
You can read more the making of HTML5Please here.
Other resources:
http://caniuse.com/ – Compatibility tables for support of HTML5, CSS3, SVG and more in desktop and mobile browsers.
http://modernizr.com – Open-source JavaScript library that gives you the power of feature detection to help you build the next generation of HTML5 and CSS3-powered websites.
http://haz.io/ – gives a quick overview of your browser’s support for recent technologies in the world of HTML, CSS and JavaScript.
http://mobilehtml5.org/ – Learn more about HTML5 compatibility on mobile and tablet browsers
[wiki] Cross-browser Polyfills
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