HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>scroll interrupted</title>
  <style>
    body { font-family: sans-serif; margin: 1rem; }
    #el {
      width: 240px; height: 120px; overflow-y: scroll;
      border: 2px dashed #7c3aed; border-radius: 8px; padding: 0.5rem;
    }
  </style>
</head>
<body>
  <div id="el">
    <p>Block 1</p><p>Block 2</p><p>Block 3</p><p>Block 4</p><p>Block 5</p>
    <p>Block 6</p><p>Block 7</p><p>Block 8</p><p>Block 9</p><p>Block 10</p>
    <p>Block 11</p><p>Block 12</p><p>Block 13</p><p>Block 14</p><p>Block 15</p>
  </div>
  <button type="button" id="long">Smooth to 500</button>
  <button type="button" id="cut">Interrupt at 0</button>
  <pre id="log">Click a button to see the Promise result.</pre>
  <script>
    var el = document.getElementById("el");
    var log = document.getElementById("log");
    async function scrollAndReport(y) {
      var result = await el.scroll({ top: y, behavior: "smooth" });
      log.textContent = (result.interrupted ? "Interrupted" : "Finished") + " (top=" + el.scrollTop + ")";
    }
    document.getElementById("long").addEventListener("click", function () {
      scrollAndReport(500);
    });
    document.getElementById("cut").addEventListener("click", function () {
      scrollAndReport(0);
    });
  </script>
</body>
</html>

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Element.scroll — Promise interrupted (Try It)