chromium/third_party/blink/web_tests/wpt_internal/css/css-pseudo/spelling-error-color-002-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]">
<style>
  div {
    padding: 10px;
    background: cyan;
  }
</style>

<p>The test passes if you cannot see a spelling error marker in the next sentence.</p>
<div id="target" contenteditable spellcheck="false">The uikc brown fox.</div>

<script>
  target.focus();
</script>