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chromium/third_party/blink/web_tests/wpt_internal/css/css-break/webkit-box-decoration-break.html 

<!doctype html>
<title>Layout and paint invalidation for -webkit-box-decoration-break change.</title>
<link rel="match" href="webkit-box-decoration-break-ref.html">
<style>
  span { border: 1px solid green; }
  span.clone { -webkit-box-decoration-break: clone }
</style>
<div><span>These lines of text<br>should have closed borders.</span></div>
<script>
  document.body.offsetTop;
  document.querySelector("span").className = "clone";
</script>