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chromium/third_party/blink/web_tests/external/wpt/css/css-highlight-api/painting/custom-highlight-painting-007.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="Highlight is repainted after adding a Range to it after registering it in the HighlightRegistry">
<style>
  ::highlight(example-highlight) {
    background-color: yellow;
    color: blue;
  }
</style>
<body><span>One </span><span>two </span><span>three…</span>
<script>
  let r1 = new Range();
  r1.setStart(document.body, 0);
  r1.setEnd(document.body, 1);
  let h = new Highlight(r1);
  let r2 = new Range();
  r2.setStart(document.body, 1);
  r2.setEnd(document.body, 2);
  CSS.highlights.set("example-highlight", h);
  h.add(r2);
</script>