(function (doc, win) {    var docEl = doc.documentElement,        resizeEvt = 'onorientationchange' in window ? 'onorientationchange' : 'resize',        recalc = function () {            var clientWidth = docEl.clientWidth;            if (!clientWidth) return;            if(clientWidth>=750){                docEl.style.fontSize = '100px';            }else{                docEl.style.fontSize = 100 * (clientWidth / 750) + 'px';            }        };    if (!doc.addEventListener) return;    win.addEventListener(resizeEvt, recalc, false);    doc.addEventListener('DOMContentLoaded', recalc, false);})(document, window);