HTML5 Please - Find out which HTML5/CSS3 features you can use (and how)

[Arthur]

Link: html5please.us

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.

The recommendations represent the collective knowledge of developers who have been deep in the HTML5 trenches.