iframe-post-message.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /resource-timing/tentative/initiator-url/iframe-post-message.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<head>

  <script src="/resources/testharness.js"></script>

  <script src="/resources/testharnessreport.js"></script>

  <script src="/common/get-host-info.sub.js"></script>

  <script src="../../resources/test-initiator.js"></script>

  <script src="../../resources/loading-resource-lib.js"></script>

</head>

<body>

  <h1>Description</h1>

  <p> This test verifies that, for a resource fetched via message handler,

      the initiator_url points to script that sends the message.

  </p>

</body>

<script>

  const channel = new MessageChannel();

  const frame = document.createElement("iframe");

  frame.addEventListener("load", () => {

    frame.contentWindow.postMessage("port", "*", [channel.port2]);

});

  frame.src = "../../resources/iframe-post-message.html";

  document.body.appendChild(frame);

  var img = document.createElement("img");

  document.body.appendChild(img);

  const label = "initiator_url_iframe_postmessage";

  const resource = "/images/blue.png?"+label;

  const hostInfo = get_host_info();

  const expectedInitiatorUrl = hostInfo["ORIGIN"] +

    "/resource-timing/tentative/initiator-url/iframe-post-message.html";

  channel.port1.onmessage = e => {

     load_image(label, img);

 initiator_url_test(resource, expectedInitiatorUrl, resource +

   " initiatorUrl from iframe postMessage()", resource + " timeout");

</script>