Why won't my HTML5 audio loop?

Question

The site is up at: http://ajf.me/stuff/eva at the time of writing. The source code is this:

Answer 1

You can just do this

The attributes do not need to have anything else.

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EDIT

According to this, Firefox doesn't like loop. It suggests a js solution:

document.getElementById('audio_2').addEventListener('ended', function(){
    this.currentTime = 0;
}, false);

http://forestmist.org/2010/04/html5-audio-loops/

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EDIT

HTML5 audio loop now works with firefox. Confirmed in version 26.0 (might have been earlier)