invisible sound on webpage?

[Vanilla]

IE9 will support it, but only play MP3 and AAC, not WAV, which is weird, as it's a Microsoft-IBM developed format.

By the way, you can stack multiple sources inside the audio tag, so that if one format is incompatible, it will automatically go on to the next format, and play it if possible:

Code:

<audio controls autobuffer>
  <source src="elvis.ogg" />
  <source src="elvis.mp3" />
  <!-- now include flash fall back -->
</audio>