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chromium/third_party/blink/web_tests/wpt_internal/css/css-pseudo/spelling-error-color-003-ref.html 

<!DOCTYPE html>
<html lang="en">
<meta charset="utf-8" />
<title>CSS Pseudo-Elements Test: Reference</title>
<link rel="author" title="Manuel Rego Casasnovas" href="mailto:[email protected]">
<script src="../support/markers.js"></script>

<p>The test passes if "quikc" has a spelling error marker that is in the default color (usually red).</p>
<div id="target" contenteditable spellcheck>The quikc brown fox.</div>

<script>
  target.focus();
  addSpellingMarker(target, 4, 9);
</script>