HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>CSS text-decoration-thickness Full Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 20px;
      background: #f8fafc;
      line-height: 1.6;
    }

    .help-link {
      text-decoration-line: underline;
      text-decoration-style: wavy;
      text-decoration-color: #dc2626;
      text-decoration-thickness: 2px;
      color: #334155;
    }
  </style>
</head>
<body>
  <h1>Help Link Styling</h1>
  <p>See the <span class="help-link">help guide</span> for details.</p>
</body>
</html>

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CSS text-decoration-thickness Property - Full Decoration Set