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chromium/third_party/blink/web_tests/external/wpt/css/css-view-transitions/modify-style-via-cssom-ref.html 

<!DOCTYPE html>
<title>View transitions: Modify style via CSSOM (ref)</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
<link rel="author" href="mailto:[email protected]">
<style>
#box {
  width: 100px;
  height: 100px;
  background: limegreen;
}
#box {
  transform: translateY(100px);
}

</style>
<div id="box"></div>