[web-animations] Setting the current time in the idle state should transition to paused not running


If an animation is in the idle state and the current time is set, the 
currently spec'ed behavior is that the animation will transition to the 
running state.

This is because when the current time is set, none of the conditions 
that would cause us to update the hold time are fulfilled.[1]

As a result we end up updating the start time which will cause the 
animation to play.

I think this is probably counter-intuitive and is certainly 
inconsistent. Generally speaking (ignoring pending/finished) we have the 
following rules applied in order:

  1. current time unresolved -> idle

  2. start time unresolved -> paused

  3. otherwise -> running

In the idle state both current time and start time are unresolved. If 
the author sets the current time only I think it's natural to assume 
that the start time remains unresolved and the animation becomes paused.

Unless anyone objects I plan to update the algorithm for setting the 
current time[1] such that it only updates the start time if the start 
time is already resolved.

Best regards,


[1] http://w3c.github.io/web-animations/#silently-set-the-current-time

Received on Wednesday, 22 April 2015 07:27:21 UTC