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chromium/third_party/blink/web_tests/external/wpt/css/css-view-transitions/new-element-on-start.html 

<!DOCTYPE html>
<html class=reftest-wait>
<title>View transitions: new element tag specified for start phase</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
<link rel="author" href="mailto:[email protected]">
<link rel="match" href="new-element-on-start-ref.html">

<script src="/common/reftest-wait.js"></script>
<style>
div {
  width: 100px;
  height: 100px;
  contain: paint;
  position: absolute;
  top: 50px;
}

.before {
  background: lightblue;
  left: 50px;
}
.after {
  background: black;
  left: 200px;
}
.hidden {
  background: red;
  left: 350px;
}

html::view-transition-group(hidden) { animation-duration: 300s; }
html::view-transition-image-pair(hidden) { opacity: 0; }

html::view-transition-group(before) { animation-duration: 0s; }
html::view-transition-image-pair(before) { filter: invert(1); }

html::view-transition-group(after) { animation-duration: 0s; }
html::view-transition-image-pair(after) { filter: invert(1); }

html::view-transition-group(root) { animation: unset; opacity: 0; }
html::view-transition { background: lightpink; }

</style>

<div id=before class=before></div>
<div id=after class=after></div>

<div id=hidden class=hidden></div>

<script>
failIfNot(document.startViewTransition, "Missing document.startViewTransition");

async function runTest() {
  hidden.style.viewTransitionName = "hidden";
  before.style.viewTransitionName = "before";
  let transition = document.startViewTransition(() => {
    before.remove();
    after.style.viewTransitionName = "after";
  });
  transition.ready.then(() => requestAnimationFrame(() => requestAnimationFrame(takeScreenshot)));
}
onload = () => requestAnimationFrame(() => requestAnimationFrame(runTest));
</script>