CSS and HTML Cheat Sheets
Cheat sheets are a one-page document that lists the tags and rules and gives their property values. Many are in PDF format so they can easily be printed and kept next to your computer while you work.
CSS 2 cheat sheet by ADDEDBYTES
CSS 2 cheat sheet (version 2)
CSS 2 cheat sheet (version 1)
CSS cheat sheet by Leslie Franke
CSS Quick Reference Guide by Cogeco
CSS Quick Reference Guide is a multi-page document that includes an overview of CSS.
CSS Specificity Calculator in Excel
Use this Excel calculator to determine specificity.