<div>
  <h2>overscroll-behavior: auto</h2>
  <ul>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
  </ul>
</div>

<div>
  <h2>overscroll-behavior: contain</h2>
  <ul class="no-scroll-chain">
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
    <li>item</li>
  </ul>
</div>
body {
  display: flex;
  justify-content: center;
  gap: 2rem;
  padding: 2rem;
  min-height: 200vh;
  background-color: #ffc857;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 80 80' width='80' height='80'%3E%3Cpath fill='%23ff9f4d' fill-opacity='0.71' d='M14 16H9v-2h5V9.87a4 4 0 1 1 2 0V14h5v2h-5v15.95A10 10 0 0 0 23.66 27l-3.46-2 8.2-2.2-2.9 5a12 12 0 0 1-21 0l-2.89-5 8.2 2.2-3.47 2A10 10 0 0 0 14 31.95V16zm40 40h-5v-2h5v-4.13a4 4 0 1 1 2 0V54h5v2h-5v15.95A10 10 0 0 0 63.66 67l-3.47-2 8.2-2.2-2.88 5a12 12 0 0 1-21.02 0l-2.88-5 8.2 2.2-3.47 2A10 10 0 0 0 54 71.95V56zm-39 6a2 2 0 1 1 0-4 2 2 0 0 1 0 4zm40-40a2 2 0 1 1 0-4 2 2 0 0 1 0 4zM15 8a2 2 0 1 0 0-4 2 2 0 0 0 0 4zm40 40a2 2 0 1 0 0-4 2 2 0 0 0 0 4z'%3E%3C/path%3E%3C/svg%3E");  
}

ul {
  position: relative;
  padding: 0;
  margin: 0;
  height: 50vh;
  overflow: auto;
  list-style: none;
}

.no-scroll-chain {
  overscroll-behavior: contain;
}

h2 {
  background-color: #1b1b1b;
  color: #fff;
  padding: 1em;
  font: 14px monospace;
  border-radius: 3px;
}

li {
  background-color: #fff;
  padding: 1rem 2rem;
  font-family: cursive;
}

li:nth-child(even) {
  background-color: #eee;
}

External CSS

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External JavaScript

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