add html in question

Question

Can I add html in a question?  Specifically I want to embed an mp3 and I want to use this code:

<audio controls>
  <source src="horse.ogg" type="audio/ogg">
  <source src="horse.mp3" type="audio/mpeg">
Your browser does not support the audio element.
</audio>

I did find this plugin (which I still cannot put to work).  But still, I want to know how to add pure html.

Comments

You want to add the HMTL as a q2a user or as a q2a developer ? :-)

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q2a user.  Not sure what you mean by "developer".

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I thought you wanted to add it modifying  (with any of the available approaches) the source code of the question page, making your change available to your website's users.
If you just want to add html code inside a question as a user of your website, check out this answer :
http://www.question2answer.org/qa/32217/allow-custom-link-tags-in-wysiwyg-editor?show=32244#a32244