timeupdate event is fired when the time indicated by the
currentTime attribute has been updated.
The event frequency is dependant on the system load, but will be thrown between about 4Hz and 66Hz (assuming the event handlers don't take longer than 250ms to run). User agents are encouraged to vary the frequency of the event based on the system load and the average cost of processing the event each time, so that the UI updates are not any more frequent than the user agent can comfortably handle while decoding the video.
|| ||The event target (the topmost target in the DOM tree).|
|| ||The type of event.|
|| ||Whether the event normally bubbles or not.|
|| ||Whether the event is cancellable or not.|
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