elementFromPoint.js

this.point = document.createElement('div');
document.body.appendChild(this.point);
this.point.style.width = '10px';
this.point.style.height = '10px';
this.point.style.backgroundColor = 'red';
this.point.style.borderRadius = '50%';
this.point.style.position = 'absolute';
this.point.style.zIndex = '999999';
this.point.style.left = '0px';
this.point.style.top = '0px';