HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>mouseup vs pointerup</title>
  <style>
    #stage { height: 120px; border: 2px solid #333; display: grid; place-items: center; user-select: none; text-align: center; padding: 12px; }
  </style>
</head>
<body>
  <div id="stage">Hold two buttons, then release them one at a time</div>
  <pre id="out">mouseup=0 pointerup=0</pre>
  <script>
    var stage = document.getElementById("stage");
    var out = document.getElementById("out");
    var mouseCount = 0;
    var pointerCount = 0;
    function render() {
      out.textContent = "mouseup=" + mouseCount + " pointerup=" + pointerCount;
    }
    stage.addEventListener("mouseup", function () {
      mouseCount++;
      render();
    });
    stage.addEventListener("pointerup", function () {
      pointerCount++;
      render();
    });
  </script>
</body>
</html>

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Element mouseup — vs pointerup (Try It)