(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';
			}
		};
	if(!doc.addeventlistener) return;
	win.addeventlistener(resizeevt, recalc, false);
	doc.addeventlistener('domcontentloaded', recalc, false);
})(document, window);