Pseudo Element AnimationsTransitions Bug Fixed in WebKit

It has been a long-standing bug in WebKit that psuedo elements (like ::before and ::after) cannot be animated or transitioned. As of yesterday that bug was fixed thanks to Elliott Sprehn. You can pop open Google Chrome Canary and see them work.

He notes in the ticket:

The new DOM based :before and :after pseudo elements support animations and transitions already, but I had disabled support so we could turn them on in a separate step.

DOM based eh? …

Pseudo Element Animations/Transitions Bug Fixed in WebKit is a post from CSS-Tricks