Fired when playback is aborted or blocked. A failed play attempt does not result in a play. Pausing the video or changing the media results in play attempts being aborted. In mobile browsers play attempts are blocked when not started by a user gesture.
Use this to determine the period of time between a user pressing play and the same user viewing their content. Triggered by a video's first frame event (or the instant an audio file begins playback). This event pinpoints when content playback begins.