HTML Code

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

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

    .box {
      height: 140px;
      overflow: auto;
      padding: 16px;
      color: #fff;
      background-image: repeating-linear-gradient(
        135deg,
        #1d4ed8 0 16px,
        #2563eb 16px 32px,
        #38bdf8 32px 48px
      );
      background-attachment: local;
    }

    .box.reset {
      margin-top: 12px;
      background-attachment: initial;
    }

    .box p {
      color: #fff;
      margin: 0 0 1rem;
    }
  </style>
</head>
<body>
  <p>The first box is <strong>local</strong>. The second uses <strong>initial</strong>, which is the same as <strong>scroll</strong>.</p>
  <div class="box">
    <p>local — Line 1</p>
    <p>Line 2</p>
    <p>Line 3</p>
    <p>Line 4</p>
  </div>
  <div class="box reset">
    <p>initial — Line 1</p>
    <p>Line 2</p>
    <p>Line 3</p>
    <p>Line 4</p>
  </div>
</body>
</html>

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CSS background-attachment Property — initial