Alternatives to Can I use for all platforms with any license

HTML5 Please

Look up HTML5, CSS3, etc features, know if they are ready for use, and if so find out how you should use them – with polyfills, fallbacks or as they are.

Free Web
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QuirksMode.org Compatibility Tables

My Compatibility Tables are by far the most popular resource on this site. Here you find the master table that contains links to the individual tables.

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Can I email

Support tables for HTML and CSS in emails.

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