d549031f_HTML_5__Dispatched_when___
[Event name] canplaythrough [Interface] Event [Preconditions] The readyState attribute is newly equal to CAN_PLAY_THROUGH. [Dispatched when...] 
The user agent estimates that if playback were to be started now, the media resource could be rendered at the current playback rate all the way to its end without having to stop for further buffering.
HTML 5
Dispatched when...