How does this html code work

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I came across this piece of html on a audio player website

  <a id="m1" class="audio {ogg:'http://ift.tt/1nMlrU0'}"  href="http://ift.tt/1nMlsY5">some music (mp3/ogg)</a>

While I can see that it is about the selection of ogg or mp3 files, how is this done? particularly, what is the role of "{ogg:'http://ift.tt/1nMlrU0'}". I've never seen this kind of html code before. Thanks.

asked 48 secs ago

user2176936

49