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chromium/third_party/blink/web_tests/external/wpt/css/css-view-transitions/set-universal-specificity.html 

<!DOCTYPE html>
<html class=reftest-wait>
<title>View transitions: universal specificity</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
<link rel="author" href="mailto:[email protected]">
<link rel="match" href="set-universal-specificity-ref.html">
<script src="/common/reftest-wait.js"></script>
<style>
#shared {
  contain: paint;
  width: 100px;
  height: 100px;
  background: blue;
  view-transition-name: shared;
}

/* We're verifying what we capture, so just display the old contents for 5 minutes.  */
html::view-transition { background: pink; }
html::view-transition-group(shared) { animation-duration: 300s; }

html::view-transition-old(shared) {
  animation: unset;
  opacity: 1;
  border: 10px solid black;
}
html::view-transition-old(*) {
  border: 10px solid red;
}

html::view-transition-new(shared) { animation: unset; opacity: 0; }

html::view-transition-old(root) { animation: unset; opacity: 0; }
html::view-transition-new(root) { animation: unset; opacity: 0 }
</style>
<div id=shared></div>
<script>
failIfNot(document.startViewTransition, "Missing document.startViewTransition");

async function runTest() {
  document.startViewTransition(() => {
    requestAnimationFrame(() => requestAnimationFrame(takeScreenshot));
  });
}
onload = () => requestAnimationFrame(() => requestAnimationFrame(runTest));
</script>