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

<!DOCTYPE html>
<title>View transitions: universal specificity (ref)</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
<link rel="author" href="mailto:[email protected]">
<style>
body {
  background: pink;
}
div {
  contain: paint;
  width: 100px;
  height: 100px;
  background: blue;
  border: 10px solid black;
}
</style>
<div></div>