"use strict";var _createClass=function(){function e(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}return function(t,n,i){return n&&e(t.prototype,n),i&&e(t,i),t}}();function _classCallCheck(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}var zoomFactor=function(){function e(t){_classCallCheck(this,e),this.el=this.q(t,document),this.b(),this.u()}return _createClass(e,[{key:"q",value:function(e){return(arguments.length>1&&void 0!==arguments[1]?arguments[1]:this.el).querySelector(e)}},{key:"b",value:function(){var e=this.el.innerHTML,t=document.createElement("z-1"),n=document.createElement("z-2"),i=document.createElement("z-3"),l=document.createElement("style");this.el.innerHTML="",this.el.appendChild(t),t.appendChild(n),n.appendChild(i),i.innerHTML=e,l.appendChild(document.createTextNode("z-1,z-2,z-3,zoom-factor{display:block}z-1,zoom-factor{position:relative;overflow:hidden}z-1,z-2{width:100%}z-1,z-2,z-3{color:#fff}z-1{float:left;overflow:hidden}z-2{position:absolute}z-3{transform-origin:left top;width:0}")),document.getElementsByTagName("head")[0].appendChild(l)}},{key:"v",value:function(){return this.q("input")?this.q("input").value:parseFloat(this.el.dataset.scale)||1}},{key:"u",value:function(){var e=this.v(),n=this.q("z-1"),i=this.q("z-2"),l=this.q("z-3");n.style=i.style=l.style="",i.style.width=n.clientWidth*e+"px",l.style.transform="scale("+e+")",n.style.height=l.clientHeight*e+"px"}}]),e}();new zoomFactor("zoom-factor");
.scaleme {
background: red;
height: 2000px;
width: 4000px;
}
<zoom-factor data-scale="0.16666667">
<div class="scaleme"></div>
</zoom-factor>
