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chromium/third_party/blink/web_tests/external/wpt/css/css-view-transitions/css-tags-shared-element-ref.html 

<!DOCTYPE html>
<title>View transitions: use css tags for shared elements (ref)</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
<link rel="author" href="mailto:[email protected]">

<style>
div { contain: paint; }
#left {
  background: blue;
  width: 100px;
  height: 100px;
  position: absolute;
  top: 50px;
  left: 50px;
}
#right {
  width: 50px;
  height: 50px;
  background: green;
  position: absolute;
  top: 50px;
  left: 250px;
}
body { background: lightpink; }
</style>

<div id=left></div>
<div id=right></div>