Function getEnclosingContainerTypes

ads/google/a4a/utils.js:858–871

(adElement)

 * @return {!Array<string>}
 */
export function getEnclosingContainerTypes(adElement) {
  const containerTypeSet = {};
  for (
    let el = adElement.parentElement, counter = 0;
    el && counter < 20;
    el = el.parentElement, counter++
  ) {
    const tagName = el.tagName.toUpperCase();
    if (ValidAdContainerTypes[tagName]) {
      containerTypeSet[ValidAdContainerTypes[tagName]] = true;
    }
  }
  return Object.keys(containerTypeSet);
}

/**
 * Appends parameter to ad request indicating error state so long as error