HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>mousemove drag only</title>
  <style>
    #stage { height: 140px; border: 2px solid #333; display: grid; place-items: center; user-select: none; }
  </style>
</head>
<body>
  <div id="stage">Press and drag</div>
  <pre id="out">idle</pre>
  <script>
    var stage = document.getElementById("stage");
    var out = document.getElementById("out");
    var dragging = false;
    stage.addEventListener("mousedown", function (event) {
      if (event.button !== 0) return;
      dragging = true;
      out.textContent = "dragging…";
    });
    stage.addEventListener("mousemove", function (event) {
      if (!dragging) return;
      out.textContent = "drag @ " + event.offsetX + "," + event.offsetY;
    });
    window.addEventListener("mouseup", function () {
      dragging = false;
      out.textContent = "idle";
    });
  </script>
</body>
</html>

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Element mousemove — drag only (Try It)