Here are some HTML5 Cheat Sheets provided by InMotion Hosting to make your life easier when it comes to HTML5. Thanks for sharing, InMotion Hosting!
HTML5 Cheat Sheet—Tags
HTML5 Cheat Sheet By InMotion Hosting - A Virtual Private Servers Provider
HTML5 Cheat Sheet—Event Handler Attributes
HTML5 Cheat Sheet By InMotion Hosting - A Web Hosting Provider