HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>pointerdown vs mousedown</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 left, then also press right (without releasing)</div>
  <pre id="out">pointerdown=0 mousedown=0</pre>
  <script>
    var stage = document.getElementById("stage");
    var out = document.getElementById("out");
    var pointerCount = 0;
    var mouseCount = 0;
    function render() {
      out.textContent = "pointerdown=" + pointerCount + " mousedown=" + mouseCount;
    }
    stage.addEventListener("pointerdown", function () {
      pointerCount++;
      render();
    });
    stage.addEventListener("mousedown", function () {
      mouseCount++;
      render();
    });
  </script>
</body>
</html>

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Element pointerdown — vs mousedown (Try It)