traverseTo-navigates-multiple-iframes.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:
- /navigation-api/navigation-methods/traverseTo-navigates-multiple-iframes.html - WPT Dashboard Interop Dashboard

<!doctype html>

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

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

<body>

<iframe id="i1" src="/common/blank.html"></iframe>

<iframe id="i2" src="resources/slow-no-store.py"></iframe>

<script>

promise_test(async t => {

  let start_length = navigation.entries().length;

  // Wait for after the load event so that the navigation doesn't get converted

  // into a replace navigation.

  await new Promise(resolve => window.onload = () => t.step_timeout(resolve, 0));

  i1.src = "/common/blank.html?navigated";

  await new Promise(resolve => i1.onload = resolve);

  i2.src = "/common/blank.html?navigated";

  await new Promise(resolve => i2.onload = resolve);

  assert_equals(navigation.entries().length, start_length);

  assert_equals(i1.contentWindow.navigation.entries().length, 2);

  assert_equals(i2.contentWindow.navigation.entries().length, 2);

  assert_equals(i1.contentWindow.navigation.currentEntry.index, 1);

  assert_equals(i2.contentWindow.navigation.currentEntry.index, 1);

  function collectKeysAndIds(win) {

    return win.navigation.entries().map(e => [e.key, e.id]).flat();

  let i1_keys_and_ids_before_back = collectKeysAndIds(i1.contentWindow);

  let i2_keys_and_ids_before_back = collectKeysAndIds(i2.contentWindow);

  // Go back to a point that requires both frames to navigate. Because i2 is

  // going back to a slow, un-cached document, i1 will likely complete before

  // the server sends the response for i2. This combination of a slow and fast

  // traversal is less common than the case where multiple iframes navigate at

  // similar speeds, and caused a bug in chromium.

  i1.contentWindow.navigation.traverseTo(i1.contentWindow.navigation.entries()[0].key);

  await Promise.all(

      [ new Promise(resolve => i1.onload = resolve),

        new Promise(resolve => i2.onload = resolve) ]);

  assert_equals(i1.contentWindow.navigation.currentEntry.index, 0);

  assert_equals(i2.contentWindow.navigation.currentEntry.index, 0);

  assert_array_equals(i1_keys_and_ids_before_back, collectKeysAndIds(i1.contentWindow));

  assert_array_equals(i2_keys_and_ids_before_back, collectKeysAndIds(i2.contentWindow));

}, "entries() should be correct after a traversal that navigates multiple browsing contexts");

</script>

</body>