如何将offsetX和offsetY坐标从像素更改为百分比？

var element = document.getElementById("element");

element.addEventListener("mousemove", function(event) {
  var offsetX = event.offsetX;
  var offsetY = event.offsetY;

  var width = element.clientWidth;
  var height = element.clientHeight;

  var offsetXPercentage = (offsetX / width) * 100;
  var offsetYPercentage = (offsetY / height) * 100;

  console.log("offsetX percentage: " + offsetXPercentage + "%");
  console.log("offsetY percentage: " + offsetYPercentage + "%");
});