Updated method of calculating

[nodesocket]

Wouldn't something like this work? This is not optimized at all, but the logic should be solid.

function browserWidth() {
    if(window && 'innerWidth' in window) {
        var innerWidth = window.innerWidth;
    }

    if(document && document.documentElement && 'clientWidth' in document.documentElement) {
        var clientWidth = document.documentElement.clientWidth;
    }

    if(typeof innerWidth !== "undefined" && typeof clientWidth !== "undefined") {
        return Math.min(innerWidth, clientWidth);
    }

    if(typeof innerWidth !== "undefined") {
        return innerWidth;
    }

    if(typeof clientWidth !== "undefined") {
        return clientWidth;
    }

    if(document && document.getElementsByTagName('body')[0] && document.getElementsByTagName('body')[0].clientWidth) {
        return document.getElementsByTagName('body')[0].clientWidth;
    }

    return null;
}