(function(doc, win) { var docEl = doc.documentElement, resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize', recalc = function() { var clientWidth = docEl.clientWidth; if(!clientWidth) return; // docEl.style.fontSize = 100 * (clientWidth / 360) + 'px'; if(clientWidth >= 600) { docEl.style.fontSize = '350px'; } else { docEl.style.fontSize = 100 * (clientWidth / 360) + 'px'; } }; if(!doc.addEventListener) return; win.addEventListener(resizeEvt, recalc, false); doc.addEventListener('DOMContentLoaded', recalc, false); })(document, window);