unset-and-initial-view-transition-name.html

<!DOCTYPE html>
<html>
<title>View transitions: validates that view-transition-name: unset or initial are ignored</title>
<link rel="help" href="https://www.w3.org/TR/css-view-transitions-1/">
<link rel="author" href="mailto:[email protected]">

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

<style>
#first {
  width: 100px;
  height: 100px;
  background: blue;
  contain: paint;
  view-transition-name: target;
}
#second {
  width: 100px;
  height: 100px;
  background: blue;
  view-transition-name: unset;
}
#third {
  width: 100px;
  height: 100px;
  background: blue;
  view-transition-name: initial;
}
</style>

<div id=first></div>
<div id=second></div>
<div id=third></div>

<script>
promise_test(async t => {
  assert_implements(document.startViewTransition, "Missing document.startViewTransition");
  return new Promise(async (resolve, reject) => {
    let transition = document.startViewTransition();
    await transition.updateCallbackDone;

    // Elements with view-transition-name: initial and unset don't have
    // containment. Because they are ignored they don't cause the transition to
    // be skipped.
    await transition.ready;
    transition.finished.then(resolve, reject);
  });
}, "validates that view-transition-name: unset or initial are ignored");
</script>

chromium/third_party/blink/web_tests/external/wpt/css/css-view-transitions/unset-and-initial-view-transition-name.html