(function()()

in website/content/js/head.js [192:321]

• 31 lines of code
• 5 McCabe index (conditional complexity)

(function() {
    /*
        To add a new test:

        head.feature("video", function() {
            var tag = document.createElement('video');
            return !!tag.canPlayType;
        });

        Good place to grab more tests

        https://github.com/Modernizr/Modernizr/blob/master/modernizr.js
    */


    /* CSS modernizer */
    var el = document.createElement("i"),
         style = el.style,
         prefs = ' -o- -moz- -ms- -webkit- -khtml- '.split(' '),
         domPrefs = 'Webkit Moz O ms Khtml'.split(' '),

         head_var = window.head_conf && head_conf.head || "head",
         api = window[head_var];


     // Thanks Paul Irish!
    function testProps(props) {
        for (var i in props) {
            if (style[props[i]] !== undefined) {
                return true;
            }
        }
    }


    function testAll(prop) {
        var camel = prop.charAt(0).toUpperCase() + prop.substr(1),
             props   = (prop + ' ' + domPrefs.join(camel + ' ') + camel).split(' ');

        return !!testProps(props);
    }

    var tests = {

        gradient: function() {
            var s1 = 'background-image:',
                 s2 = 'gradient(linear,left top,right bottom,from(#9f9),to(#fff));',
                 s3 = 'linear-gradient(left top,#eee,#fff);';

            style.cssText = (s1 + prefs.join(s2 + s1) + prefs.join(s3 + s1)).slice(0,-s1.length);
            return !!style.backgroundImage;
        },

        rgba: function() {
            style.cssText = "background-color:rgba(0,0,0,0.5)";
            return !!style.backgroundColor;
        },

        opacity: function() {
            return el.style.opacity === "";
        },

        textshadow: function() {
            return style.textShadow === '';
        },

        multiplebgs: function() {
            style.cssText = "background:url(//:),url(//:),red url(//:)";
            return new RegExp("(url\\s*\\(.*?){3}").test(style.background);
        },

        boxshadow: function() {
            return testAll("boxShadow");
        },

        borderimage: function() {
            return testAll("borderImage");
        },

        borderradius: function() {
            return testAll("borderRadius");
        },

        cssreflections: function() {
            return testAll("boxReflect");
        },

        csstransforms: function() {
            return testAll("transform");
        },

        csstransitions: function() {
            return testAll("transition");
        },

        /*
            font-face support. Uses browser sniffing but is synchronous.

            http://paulirish.com/2009/font-face-feature-detection/
        */
        fontface: function() {
            var ua = navigator.userAgent, parsed;

            if (/*@cc_on@if(@_jscript_version>=5)!@end@*/0)
                return true;
                
            if (parsed = ua.match(/Chrome\/(\d+\.\d+\.\d+\.\d+)/))
                return parsed[1] >= '4.0.249.4' || 1 * parsed[1].split(".")[0] > 5;
            if ((parsed = ua.match(/Safari\/(\d+\.\d+)/)) && !/iPhone/.test(ua))
                return parsed[1] >= '525.13';
            if (/Opera/.test({}.toString.call(window.opera)))
                return opera.version() >= '10.00';
            if (parsed = ua.match(/rv:(\d+\.\d+\.\d+)[^b].*Gecko\//))
                return parsed[1] >= '1.9.1';

            return false;
        }
    };

    // queue features
    for (var key in tests) {
        if (tests[key]) {
            api.feature(key, tests[key].call(), true);
        }
    }

    // enable features at once
    api.feature();

})();