How to create HTML Slides with audio for online lectures? This follows on from a recent question about embedding audio in PDF slides. I don't like the thought of users needing to use a particular PDF viewer in order to hear the audio and I don't like the thought of needing proprietary software just to create the presentations. Thus, another option would be to create HTML slides. There are a range of HTML slide production approaches (e.g., S5, DZSlides, Slidy, Slideous).

Update: 
I was thinking about  using pandoc to convert markdown into one of the slide formats. @Federico mentions the audio HTML tag. I assume that would be part of an overall solution. This presumably represents a basic answer, but I'd be keen to get some guidance about how this works on a practical level:


Are there any examples of implementing audio in HTML slides?
Are there any strategies for increasing the usability of consuming and activating the audio?
Are there any browser or operating system compatibility issues?


Thus, in a broad sense my question is

How can HTML slides be created in an effective and efficient way with embedded audio?
If I read correctly, in all those HTML slide systems you write the HTML file directly, it is not produced by some external tool. So I think you can simply put an audio tag in it. Or am I missing something?