transition-in-removed-iframe.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:
- /css/css-view-transitions/transition-in-removed-iframe.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

<head>

  <title>View transitions: startViewTransition in a removed iframe</title>

  <link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">

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

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

</head>

<body>

<script>

promise_test(async t => {

  assert_implements(document.startViewTransition, "Missing document.startViewTransition");

  let iframe = document.createElement("iframe");

  document.body.appendChild(iframe);

  let doc = iframe.contentDocument;

  // Remove the iframe, detaching the document.

  iframe.remove();

  // startViewTransition should return a valid ViewTransition object, not null.

  let transition = doc.startViewTransition(() => {});

  assert_not_equals(transition, null, "startViewTransition should not return null");

  assert_equals(Object.prototype.toString.call(transition), "[object ViewTransition]", "should return a ViewTransition object");

  // ready promise should be a valid promise and reject with AbortError.

  try {

    await transition.ready;

    assert_unreached("ready promise should have rejected");

  } catch (e) {

    assert_equals(e.name, "AbortError", "ready promise should reject with AbortError");

  // finished promise should be a valid promise and resolve successfully.

  await transition.finished;

}, "A view transition in a removed iframe should return a skipped transition object and not return null");

</script>

</body>

</html>