custom-highlight-painting-prioritization-001.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="Highlights are prioritized correctly by changing their .priority (higher priority is painted on top no matter the order of insertion into the HighlightRegistry)">
<style>
  ::highlight(example-highlight) {
    background-color: yellow;
    color: blue;
  }
  ::highlight(another-highlight) {
    background-color: red;
    color: orange;
  }
</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 h1 = new Highlight(r);
  let h2 = new Highlight(r);
  h1.priority = 2;
  h2.priority = 1;
  CSS.highlights.set("example-highlight", h1);
  CSS.highlights.set("another-highlight", h2);
</script>

chromium/third_party/blink/web_tests/external/wpt/css/css-highlight-api/painting/custom-highlight-painting-prioritization-001.html