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chromium/third_party/blink/web_tests/external/wpt/css/css-view-transitions/no-root-capture-ref.html 

<!DOCTYPE html>
<title>View transitions: shared element with overflow (ref)</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
<link rel="author" href="mailto:[email protected]">
<style>
.target {
  width: 100px;
  height: 100px;
  contain: paint;
  background: blue;
  overflow-clip-margin: 50px;
  view-transition-name: target;
}
.child {
  width: 200px;
  height: 200px;
  position: relative;
  top: 50px;
  left: 50px;
  background: green;
}
</style>

This text should appear unmodified, since the root isn't captured.
<div class=target>
  <div class=child>
  </div>
</div>