HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>overscroll-behavior: 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;
    }

    .outer {
      height: 220px;
      overflow: auto;
      border: 1px solid #94a3b8;
      padding: 8px;
    }

    .inner {
      height: 80px;
      overflow: auto;
      overscroll-behavior: contain;
      border: 1px solid #3b82f6;
      padding: 8px;
      margin-bottom: 8px;
    }

    .inner.reset {
      overscroll-behavior: initial;
    }
  </style>
</head>
<body>
  <p>The first blue box uses <strong>contain</strong>. The second uses <strong>initial</strong>, which resets to <code>auto</code>.</p>
  <div class="outer">
    <div class="inner">
      Contain: chaining blocked<br>
      Line 2<br>
      Line 3<br>
      Line 4
    </div>
    <div class="inner reset">
      Initial (= auto): may chain<br>
      Line 2<br>
      Line 3<br>
      Line 4
    </div>
    Outer A<br>
    Outer B<br>
    Outer C
  </div>
</body>
</html>

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CSS overscroll-behavior Property — initial