HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>mozInputSource — touch branch</title>
  <style>
    #box {
      width: 220px;
      height: 100px;
      border: 2px solid #333;
      display: flex;
      align-items: center;
      justify-content: center;
      user-select: none;
    }
  </style>
</head>
<body>
  <div id="box">Press here</div>
  <pre id="out">—</pre>
  <script>
    var MOZ_SOURCE_TOUCH = 5;
    var MOZ_SOURCE_MOUSE = 1;
    var box = document.getElementById("box");
    var out = document.getElementById("out");
    box.addEventListener("mousedown", function (e) {
      if (typeof e.mozInputSource !== "number") {
        out.textContent = "Use pointerType instead on this browser";
        return;
      }
      if (e.mozInputSource === MOZ_SOURCE_TOUCH) {
        out.textContent = "Touch source — prefer larger hit targets";
      } else if (e.mozInputSource === MOZ_SOURCE_MOUSE) {
        out.textContent = "Mouse source — fine-grained coordinates OK";
      } else {
        out.textContent = "Other source: " + e.mozInputSource;
      }
    });
  </script>
</body>
</html>

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MouseEvent.mozInputSource — touch vs mouse (Try It)