(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;
	recalc();
	win.addEventListener(resizeEvt, recalc, false);
})(document, window);