The (many) reasons why you could not have JS.

"Can I use" provides up-to-date browser support tables for support of front-end web technologies on desktop and mobile web browsers.

Remembering what CSS to prefix is hard. Today browsers develop quickly (yay) and things often change (boo). Preprocessors and mixin libraries are not always up to date.

This page has one purpose: simply show what prefixes are needed for a newer CSS property. Need more information? Check the awesome Can I Use or Autoprefixer!