web-animations/web-animations-js — pull request #536 by alancutter (2014-01-24 03:01:05+00:00)
Title: match spec's definition of the active phase for a timed item

Spec text:
A timed item is in the after phase if the timed item's local time is not null and is greater than or equal to the sum of its start delay and active duration.

http://dev.w3.org/fxtf/web-animations/#timed-item-phases-and-states