canplay event is fired when the user agent can play the media, but
estimates that not enough data has been loaded to play the media up to its end without
having to stop for further buffering of content.
element.oncanplay = handlerFunction; var handlerFunction = element.oncanplay;
handlerFunction is either
specifying the handler for the event.
|HTML Living Standard
The definition of 'oncanplay' in that specification.
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