mozilla/butter — pull request #1476 by Pomax (2013-02-05 17:43:29+00:00)
Title: added CSS transition for the post-roll container - 1s delay, 1s fadein

also modified embed.js to not use show() and hide() for the post roll container, because they flip display:block and display:none, which clobbers CSS transitions completely. I only refactored this for the post roll container, but I'll file an issue to refactor them out of existence.