HTML Code

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

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

    .feed {
      height: 140px;
      overflow: auto;
      border: 1px solid #cbd5e1;
      padding: 8px;
      max-width: 20rem;
    }

    .banner {
      overflow-anchor: none;
      margin: 0 0 8px;
      padding: 8px;
      background: #fef3c7;
    }

    .feed p {
      margin: 0 0 8px;
    }

    button {
      margin-bottom: 12px;
    }
  </style>
</head>
<body>
  <p>The banner uses <strong>overflow-anchor: none</strong>. The rest of the feed keeps the default <code>auto</code>.</p>
  <button type="button" id="grow">Grow banner</button>
  <div class="feed">
    <div class="banner" id="banner">Promo banner</div>
    <p>Older item</p>
    <p><strong>Reading here</strong></p>
    <p>More below</p>
    <p>More below</p>
  </div>
  <script>
    document.getElementById("grow").onclick = function () {
      var b = document.getElementById("banner");
      b.textContent += " more text";
    };
  </script>
</body>
</html>

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CSS overflow-anchor Property — exclude one element