Rudimentary HTML5 feature support testing.

html5.js

for (var k in html5)
    console.log(k, '...', html5[k]);

(function(window, document, navigator, undefined) {
    var html5 = {
        appcache:   !!(window.applicationCache),
        audio:      !!(document.createElement('audio').canPlayType),
        dragdrop:   !!('draggable' in document.createElement('span')),
        fileapi:    !!(typeof FileReader !== 'undefined'),
        geolocate:  !!(navigator.geolocation),
        localstore: !!(('localStorage' in window) && (window['localStorage'] !== null)),
        workers:    !!(window.Worker),
    };
    // expose
    window.html5 = html5;
})(this, document, navigator);