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chromium/third_party/blink/web_tests/external/wpt/css/css-view-transitions/old-content-captures-root-ref.html 

<!DOCTYPE html>
<title>View transitions: capture root elements (ref)</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
<link rel="author" href="mailto:[email protected]">
<style>
.box {
  background: lightblue;
  width: 100px;
  height: 100px;
  contain: paint;
  position: absolute;
  font-size: 30pt;
}
#e1 {
  top: 20px;
  left: 20px;
}
</style>
<div id=e1 class=box></div>