d549031f_HTML_5__Dispatched_when___
[Event name] canshowcurrentframe [Interface] Event [Preconditions] The readyState attribute is newly equal to CAN_SHOW_CURRENT_FRAME. [Dispatched when...] 
The user agent cannot render the data after the current playback position because data for the next frame is not immediately available.
HTML 5
Dispatched when...