Function failedToLoad

src/utils/event-helper.js:222–238

* Emit error on load failure. * @param {!Element|!Window} eleOrWindow Supports both Elements and as a special * case Windows.

(eleOrWindow)

 *     case Windows.
 */
function failedToLoad(eleOrWindow) {
  // Mark the element as errored since some elements - like HTMLMediaElement
  // using HTMLSourceElement - do not provide any synchronous way to verify if
  // they already errored, even though the error event was already dispatched.
  if (isHTMLMediaElement(eleOrWindow)) {
    eleOrWindow[MEDIA_LOAD_FAILURE_SRC_PROPERTY] =
      eleOrWindow.currentSrc || true;
  }

  // Report failed loads as user errors so that they automatically go
  // into the "document error" bucket.
  let target = eleOrWindow;
  if (target && target.src) {
    target = target.src;
  }
  throw user().createError(LOAD_FAILURE_PREFIX, target);
}

/**
 * Returns true if the parameter is a HTMLMediaElement.