HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>hasPointerCapture basic</title>
  <style>
    #target {
      width: 260px;
      height: 100px;
      border: 2px dashed #555;
      display: flex;
      align-items: center;
      justify-content: center;
      touch-action: none;
      user-select: none;
    }
  </style>
</head>
<body>
  <div id="target">Pointer down here</div>
  <pre id="out">—</pre>
  <script>
    var el = document.getElementById("target");
    var out = document.getElementById("out");
    el.addEventListener("pointerdown", function (ev) {
      el.setPointerCapture(ev.pointerId);
      out.textContent = el.hasPointerCapture(ev.pointerId)
        ? "capture active"
        : "capture lost";
    });
  </script>
</body>
</html>

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Element.hasPointerCapture — MDN basic (Try It)