(function (doc, win) {
    document.oncontextmenu = function () { return false; }
    document.onkeydown = function () {

        if (window.event && window.event.keyCode == 123) {
            event.keyCode = 0;
            event.returnValue = false;
        }
        if (window.event && window.event.keyCode == 13) {
            window.event.keyCode = 505;
        }
        if (window.event && window.event.keyCode == 8) {
            window.event.returnValue = false;
        }
    }

    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);

document.addEventListener('gesturestart', function (e) {
    e.preventDefault();
});

document.addEventListener('dblclick', function (e) {
    e.preventDefault();
});
document.addEventListener('touchstart', function (event) {
    if (event.touches.length > 1) {
        event.preventDefault();
    }
});
var lastTouchEnd = 0;
document.addEventListener('touchend', function (event) {
    var now = (new Date()).getTime();
    if (now - lastTouchEnd <= 300) {
        event.preventDefault();
    }
    lastTouchEnd = now;
}, false);