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chromium/third_party/blink/web_tests/external/wpt/css/css-highlight-api/painting/custom-highlight-painting-003.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-003-ref.html">
<meta name="assert" value="Intersections of overlapping ranges contained in the same Highlight are painted only once">
<style>
  ::highlight(sample) { background-color: rgba(0, 0, 255, 0.3); }
</style>
<body>Lorem Ipsum.
<script>
  let textNode = document.body.firstChild;

  let r1 = new Range();
  r1.setStart(textNode, 1);
  r1.setEnd(textNode, 5);

  let r2 = new Range();
  r2.setStart(textNode, 3);
  r2.setEnd(textNode, 7);

  CSS.highlights.set("sample", new Highlight(r1, r2));
</script>