window-top-inner.html

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<!DOCTYPE html>

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

<script src="utils.js"></script>

<title>Fenced frame content to report the value of window.top</title>

<body>

<script>

async function init() { // Needed in order to use top-level await.

  // This file is meant to run in a <fencedframe>. It reports back to the

  // outermost page whether or not the value of `window.top` was correct for:

  //   1.) Top-level fenced frames

  //   2.) Nested iframes inside a fenced frame

  //   3.) Nested fenced frames

  const url = new URL(location.href);

  const [window_top_key, window_top_ack_key, nested] = parseKeylist();

  // Report whether or not `window.top` was correct.

  let pass_string = "";

  if (nested == "nested")

    pass_string = "pass: fenced frame > fenced frame";

  else

    pass_string = "pass: fenced frame";

  let result = (window.top == window) ? pass_string : "fail";

  writeValueToServer(window_top_key, result);

  // If this page is a nested fenced frame, all we need to do is report the

  // top-level value.

  if (nested == "nested")

    return;

  // Wait for ACK, so we know that the outer page has read the last value from

  // the `window_top_key` stash and we can write to it again.

  await nextValueFromServer(window_top_ack_key);

  // Now test `window.top` inside an iframe.

  const iframe = document.createElement('iframe');

  iframe.src = "dummy.html";

  const load_promise = new Promise((resolve, reject) => {

    iframe.onload = resolve;

    iframe.onerror = reject;

});

  document.body.append(iframe);

  await load_promise;

  // Report whether or not the subframe's `window.top` was correct.

  result = (iframe.contentWindow.top == window) ?

      "pass: fenced frame > iframe" : "fail";

  writeValueToServer(window_top_key, result);

  // Wait for ACK, so we know that the outer page has read the last value from

  // the `window_top_key` stash and we can write to it again.

  await nextValueFromServer(window_top_ack_key);

  attachFencedFrame(generateURL("window-top-inner.html",

      [window_top_key, window_top_ack_key, "nested"]));

init();

</script>

</body>