gistfile1.txt

    tests['video'] = function() {
        var elem = document.createElement('video'),
            bool = false;
            
        // IE9 Running on Windows Server SKU can cause an exception to be thrown, bug #224
        try {
            if ( bool = !!elem.canPlayType ) {
                bool      = new Boolean(bool);
                bool.ogg  = elem.canPlayType('video/ogg; codecs="theora"');

                // Workaround required for IE9, which doesn't report video support without audio codec specified.
                //   bug 599718 @ msft connect
                var h264 = 'video/mp4; codecs="avc1.42E01E';
                bool.h264 = elem.canPlayType(h264 + '"') || elem.canPlayType(h264 + ', mp4a.40.2"');

                bool.webm = elem.canPlayType('video/webm; codecs="vp8, vorbis"');
            }
            
        } catch(e) { }
        
        return bool;
    };