HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>overflow-anchor: none</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;
      overflow-anchor: none;
      border: 1px solid #cbd5e1;
      padding: 8px;
      max-width: 20rem;
    }

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

    button {
      margin-bottom: 12px;
    }
  </style>
</head>
<body>
  <p>Scroll to <strong>Reading here</strong>, then insert above. With <strong>overflow-anchor: none</strong>, the view can jump.</p>
  <button type="button" id="insert">Insert above</button>
  <div class="feed" id="feed">
    <div id="top"></div>
    <p>Older item</p>
    <p>Older item</p>
    <p><strong>Reading here</strong></p>
    <p>More below</p>
    <p>More below</p>
  </div>
  <script>
    document.getElementById("insert").onclick = function () {
      var el = document.createElement("p");
      el.textContent = "Inserted block";
      document.getElementById("top").appendChild(el);
    };
  </script>
</body>
</html>

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CSS overflow-anchor Property — none