Function getFrameAttributes

src/3p-frame.js:33–44

* Produces the attributes for the ad template. * @param {!Window} parentWindow * @param {!AmpElement} element * @param {string=} opt_type * @param {Object=} opt_context * @return {!JsonObject} Contains * - type, width, height, src attributes of tag. These have * precedence

(parentWindow, element, opt_type, opt_context)

 *     - A _context object for internal use.
 */
function getFrameAttributes(parentWindow, element, opt_type, opt_context) {
  const type = opt_type || element.getAttribute('type');
  userAssert(type, 'Attribute type required for <amp-ad>: %s', element);
  const sentinel = generateSentinel(parentWindow);
  let attributes = {};
  // Do these first, as the other attributes have precedence.
  addDataAndJsonAttributes_(element, attributes);
  attributes = getContextMetadata(parentWindow, element, sentinel, attributes);
  attributes['type'] = type;
  Object.assign(attributes['_context'], opt_context);
  return attributes;
}

/**
 * Creates the iframe for the embed. Applies correct size and passes the embed