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<!DOCTYPE html>
<html>
<head>
<style>
.spelling-error {
  text-decoration-line: underline;
  text-decoration-style: wavy;
  text-decoration-color: red;
}
</style>
</head>
<body>
<h1>The u element + CSS</h1>
<p>This is some <u class="spelling-error">mispeled</u> text.</p>
</body>
</html>