HTML Code

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

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

    .outer {
      height: 200px;
      overflow: auto;
      border: 1px solid #94a3b8;
      padding: 8px;
    }

    .inner {
      height: 100px;
      overflow: auto;
      overscroll-behavior: auto;
      border: 1px solid #3b82f6;
      padding: 8px;
      margin-bottom: 8px;
    }
  </style>
</head>
<body>
  <p><strong>overscroll-behavior: auto</strong> is the default. Scroll the blue box to its edge, then keep scrolling — the outer box may move.</p>
  <div class="outer">
    <div class="inner">
      Inner line 1<br>
      Inner line 2<br>
      Inner line 3<br>
      Inner line 4<br>
      Inner line 5 — keep scrolling
    </div>
    Outer A<br>
    Outer B<br>
    Outer C<br>
    Outer D
  </div>
</body>
</html>

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CSS overscroll-behavior Property — auto