HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>CSS overscroll-behavior-y Example</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 2rem;
      min-height: 150vh;
    }
    .scroll-container {
      width: 300px;
      height: 200px;
      overflow: auto;
      border: 1px solid #ccc;
      overscroll-behavior-y: contain;
    }
    .content {
      height: 400px;
      background: linear-gradient(#e66465, #9198e5);
    }
    .hint {
      margin-top: 1rem;
      max-width: 22rem;
      font-size: 0.9rem;
      color: #64748b;
    }
  </style>
</head>
<body>
  <h1>Overscroll Behavior Y Example</h1>
  <p class="hint">Scroll inside the box up or down, then keep scrolling. The page behind should not scroll because of <code>overscroll-behavior-y: contain</code>.</p>
  <div class="scroll-container">
    <div class="content"></div>
  </div>
</body>
</html>

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CSS overscroll-behavior-y Property - contain