chromium/third_party/blink/web_tests/wpt_internal/css/css-pseudo/spelling-error-shadow-dynamic.html

<!DOCTYPE html>
<html lang="en">
<meta charset="utf-8" />
<title>CSS Pseudo-Elements Test: Shadow on a spelling error</title>
<link rel="author" title="Stephen Chenney" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-pseudo/#selectordef-spelling-error">
<meta name="assert" content="Verify that a shadow on a spelling marker is rendered correctly.">
<link rel="match" href="spelling-error-shadow-dynamic-ref.html">
<script src="../support/markers.js"></script>
<style>
  ::spelling-error {
    color: green;
    text-shadow: 0.25em 0.25em 3px rgba(0,0,128,0.5);
    text-decoration-line: none;
  }
  div {
    color: black;
    text-shadow: 0.1em 0.1em 3px rgba(0,0,0,0.5);
  }
</style>

<p>The test passes if "quikc" has a spelling error marker that is green with no shadow.</p>
<div id="target" contenteditable spellcheck>The quikc brown fox.</div>

<script>
  target.focus();
  addSpellingMarker(target, 4, 9);
  requestAnimationFrame(() => requestAnimationFrame(() => {
    document.styleSheets[0].cssRules[0].style.textShadow = "";
    takeScreenshot();
  }));
</script>
</html>