HTMLMediaElement.onerror
  The onerror property of the
  HTMLMediaElement interface is the event handler for
  processing error events.
  The error event fires when some form of error occurs while attempting to
  load or perform the media.
Value
  A function which serves as the event handler for the error
  event. When an error occurs, the specified function will be called. If
  null, no error handler is in effect.
Specifications
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