HTML Code

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

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

    div {
      padding: 24px;
      border: 12px double transparent;
      background-image: linear-gradient(135deg, #facc15, #ef4444);
      background-clip: border-area;
    }
  </style>
</head>
<body>
  <p><strong>background-clip: border-area</strong> paints only where the border is drawn. Support is Limited: Chrome 150+, Safari 18.2+, and not Firefox. Unsupported browsers keep a plain transparent border.</p>
  <div>Content area</div>
</body>
</html>

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CSS background-clip Property — border-area