Apps Android 4.0.3 Browser - audio.canPlayType() not working ?

[rickygai]

I am using Samsung Galaxy S2, Andriod 4.0.3 and below is HTML5 audio elements JavaScript to detect if Android default Browser support certain audio types of MP3, OGG and WAV.

function OnAudioSupportGet (audio)
{
var ext = "";
if( audio.canPlayType("audio/ogg") =="probably" ||
audio.canPlayType("audio/ogg") == "maybe")
{
ext = "ogg";
}
else
if( audio.canPlayType("audio/wav") =="probably" ||
audio.canPlayType("audio/wav") == "maybe")
{
ext = "wav";
}
else
if( audio.canPlayType("audio/mp3") == "probably" ||
audio.canPlayType("audio/mp3") == "maybe")
{
ext = "mp3";
}

return ext;
}

Via html5test.com, it seems default Android Browser able to play MP3 but
yet, it failed to be recognized at instructions above.

Any help, link, hint or guideline will be appreciated )