 'client' " +
             "referrer is fetched with no 'Referer' header");
const testFetchURLReferrer =
  async_test("The fetch() API in an about:blank iframe with a custom URL " +
             "referrer is fetched with a 'Referer` header that uses the " +
             "outer document's URL along with its referrer policy");
const testDocumentReferrer =
  async_test("The value of document.referrer in an about:blank iframe is the " +
             "outer document's full URL, regardless of referrer policy");
c