duplicate-tag-rejects-start.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/duplicate-tag-rejects-start.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

<title>View transitions: duplicate tags in the new DOM skip the transition</title>

<link rel="help" href="https://www.w3.org/TR/css-view-transitions-1/">

<link rel="author" href="mailto:khushalsagar@chromium.org">

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

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

<style>

div {

  width: 100px;

  height: 100px;

  background: blue;

  contain: paint;

</style>

<div id=first></div>

<div id=second></div>

<script>

promise_test(async t => {

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

  return new Promise((resolve, reject) => {

    first.style = "view-transition-name: target";

    let transition = document.startViewTransition(() => {

      first.style = "view-transition-name: target";

      second.style = "view-transition-name: target";

});

    // First updateCallbackDone resolves since the callback runs successfully.

    let updateCallbackDoneResolved = false;

    transition.updateCallbackDone.then(() => { updateCallbackDoneResolved = true; }, reject);

    // Then finished resolves since updateCallbackDone was already resolved.

    let finishResolved = false;

    transition.updateCallbackDone.then(() => {

      assert_true(updateCallbackDoneResolved, "updateCallbackDone not resolved before finish");

      finishResolved = true;

    }, reject);

    // Finally ready rejects.

    transition.ready.then(reject, () => {

      assert_true(finishResolved, "finish not resolved before ready");

      resolve();

});

});

}, "Two different elements with the same name in the new DOM should skip the transition");

</script>