HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>outline-width: inherit</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

    p {
      margin: 0 0 12px;
      max-width: 40rem;
      line-height: 1.5;
    }

    section {
      outline-width: 6px;
      outline-style: solid;
      outline-color: #2563eb;
      border: 1px solid #cbd5e1;
      padding: 16px;
      max-width: 18rem;
    }

    div {
      outline-width: inherit;
      outline-style: solid;
      outline-color: #0f766e;
      border: 1px solid #e2e8f0;
      padding: 12px;
      margin-top: 12px;
      background: #f8fafc;
    }
  </style>
</head>
<body>
  <p>The parent is 6px. The child uses <strong>outline-width: inherit</strong>, so it also becomes 6px thick.</p>
  <section>
    Parent: 6px
    <div>Child: inherit</div>
  </section>
</body>
</html>

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CSS outline-width Property — inherit