"use strict"; window.onpointermove = function (event) { var pageX = event.pageX, pageY = event.pageY; var momentumX = pageX + pageX - blob.offsetLeft; var momentumY = pageY + pageY - blob.offsetTop; blob.animate({ left: "".concat(momentumX, "px"), top: "".concat(momentumY, "px") }, { duration: 1500, fill: "forwards" }); blob.animate({ left: "".concat(pageX, "px"), top: "".concat(pageY, "px") }, { duration: 500, fill: "forwards" }); blob.style.left = "".concat(pageX, "px"); blob.style.top = "".concat(pageY, "px"); };