detect audio element supported

daes.js

var audioElementSupported = (function(d) {
    var a = d.createElement("audio"),
        o = {},
        s = "audio\/";

    if (typeof a.canPlayType === "function") {
        o.supported = Boolean(true);
        o.mp3 = a.canPlayType(s + "mpeg");
        o.wav = a.canPlayType(s + 'wav; codecs="1"');
        o.ogg = a.canPlayType(s + 'ogg; codecs="vorbis"');
        o.m4a = a.canPlayType(s + "x-m4a") || a.canPlayType(s + "aac");
        o.webm = a.canPlayType(s + 'webm; codecs="vorbis"');
    } else {
        o.supported = Boolean(0);
    }
    return o;
})(this.document);

memo.txt

## usage ##

document.write(
    audioElementSupported.supported + "<br />" +
    audioElementSupported.mp3 + "<br />" +
    audioElementSupported.wav + "<br />" +
    audioElementSupported.ogg + "<br />" +
    audioElementSupported.m4a + "<br />" +
    audioElementSupported.webm + "<br />"
);