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"In order to restart an animation, it must be removed then reapplied." This does not literally work across browsers today, except by reapplying the property asynchronously or, possibly, with a call to getComputedStyle() in between to flush property updates. This relates to the overall issue of defining when properties compute but I'd like to attempt capturing this.
*** Bug 14986 has been marked as a duplicate of this bug. ***
On second thought, I do not think there is any browser requirement we can specify here. Closing.