Can I use Alternatives
Can I use is described as 'Compatibility tables for support of HTML5, CSS3, SVG and more in desktop and mobile browsers' and is a compatibility layer tool in the development category. There are three alternatives to Can I use, not only websites but also apps for. The best alternative is HTML5 Please, which is free. Other great sites and apps similar to Can I use are QuirksMode.org Compatibility Tables and Can I email.
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.
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.
No screenshots yetSupport tables for HTML and CSS in emails.