HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>background-attachment: 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 {
      height: 160px;
      overflow: auto;
      padding: 16px;
      color: #fff;
      background-image: repeating-linear-gradient(
        135deg,
        #1d4ed8 0 16px,
        #2563eb 16px 32px,
        #38bdf8 32px 48px
      );
      background-attachment: local;
    }

    section p,
    div p {
      color: #fff;
      margin: 0 0 1rem;
    }

    div {
      padding: 12px;
      border: 1px solid rgba(255, 255, 255, 0.5);
      background-image: repeating-linear-gradient(
        135deg,
        #0f766e 0 16px,
        #14b8a6 16px 32px,
        #5eead4 32px 48px
      );
      background-attachment: inherit;
    }
  </style>
</head>
<body>
  <p>The child uses <strong>inherit</strong>, so it copies the parent's <strong>local</strong> value.</p>
  <section>
    <p>Parent — local</p>
    <div>
      <p>Child inherits</p>
      <p>Scroll the outer box</p>
      <p>Both use local</p>
    </div>
    <p>More parent text</p>
    <p>End</p>
  </section>
</body>
</html>

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CSS background-attachment Property — inherit