custom-highlight-painting-text-decoration-dynamic-001.html

<!DOCTYPE html>
<html class="reftest-wait">
<meta charset="utf-8">
<title>CSS Highlight API Test: ::highlight dynamic change text-decoration</title>
<link rel="help" href="https://drafts.csswg.org/css-highlight-api-1/">
<link rel="match" href="custom-highlight-painting-text-decoration-dynamic-001-ref.html">
<meta name="assert" content="This test checks that it's possible to modify dynamically the text-decoration of a custom highlight through ::highlight pseudo-element.">
<script src="/common/reftest-wait.js"></script>
<style>
  ::highlight(example) {
    text-decoration: solid underline red;
  }
</style>
<p>The test passes if it line below has a green underline.</p>
<div id="target">target</div>
<script>
  let range = new Range();
  range.setStart(target, 0);
  range.setEnd(target, 1);
  CSS.highlights.set(`example`, new Highlight(range));

  requestAnimationFrame(() => requestAnimationFrame(() => {
    document.styleSheets[0].cssRules[0].style.textDecorationColor = "green";
    takeScreenshot();
  }));
</script>
</html>

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