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api = {
    viewport: function() {
        var e = window, a = 'inner';
        if (!('innerWidth' in window )) {
            a = 'client';
            e = document.documentElement || document.body;
        }
        return { width : e[ a+'Width' ] , height : e[ a+'Height' ] };
    }
};

var screenWidth = api.viewport().width;
var screenHeight = api.viewport().height;