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chromium/third_party/blink/web_tests/external/wpt/css/css-highlight-api/painting/custom-highlight-painting-014.html 

<!DOCTYPE html>
<meta charset="UTF-8">
<title>CSS Highlight API Test: </title>
<link rel="help" href="https://drafts.csswg.org/css-highlight-api-1/">
<link rel="match" href="custom-highlight-painting-001-ref.html">
<meta name="assert" value="Registering the same Highlight under different names and again with a used name works as it should.">
<style>
  ::highlight(foo) {
    color: blue;
  }
  ::highlight(bar) {
    background-color: yellow;
  }
</style>
<body><span>One </span><span>two </span><span>three…</span>
<script>
  let r = new Range();
  r.setStart(document.body, 0);
  r.setEnd(document.body, 2);

  let h = new Highlight(r);

  CSS.highlights.set("foo", h);
  CSS.highlights.set("bar", h);
  CSS.highlights.set("foo", h);
</script>