(function(doc,win){

var docEl = doc.documentElement,resizeEvt = 'orientationchange' in window ? 'orientationchange' : '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';

}

// docEl.style.fontSize = '100px';

};

if (!doc.addEventListener) return;

win.addEventListener(resizeEvt, recalc, false);

doc.addEventListener('DOMContentLoaded', recalc, false);

})(document,window);