HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>setPointerCapture slider</title>
  <style>
    #slider {
      width: 140px;
      height: 50px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: #ffbbee;
      touch-action: none;
      user-select: none;
      cursor: grab;
      margin: 24px 0;
    }
    #status { font-family: monospace; }
  </style>
</head>
<body>
  <p>Press and drag SLIDE ME — capture keeps events outside the box.</p>
  <div id="slider">SLIDE ME</div>
  <pre id="status">—</pre>
  <script>
    var slider = document.getElementById("slider");
    var status = document.getElementById("status");
    function beginSliding(e) {
      slider.onpointermove = slide;
      slider.setPointerCapture(e.pointerId);
      status.textContent = "capture set (pointerId " + e.pointerId + ")";
    }
    function stopSliding(e) {
      slider.onpointermove = null;
      slider.releasePointerCapture(e.pointerId);
      status.textContent = "capture released";
    }
    function slide(e) {
      slider.style.transform = "translate(" + (e.clientX - 70) + "px)";
    }
    slider.onpointerdown = beginSliding;
    slider.onpointerup = stopSliding;
  </script>
</body>
</html>

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Element.setPointerCapture — MDN slider (Try It)