Audio files - MP3 playing in browser

Summary

How do I get MP3 files to play within Course?

Content

I can't believe I'm asking this question but something that is normally simple html is not working.

I am trying to create a small player on screen for a mp3 file. I am using the classic course player I believe.

I've done:

1. HTML <Audio> code like:

<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>

2. I've used the "insert audio" feature from the wysiwyg editor - this did not display well in all browsers