Description:
Right now I can save LibreOffice Writer document as HTML. It has 'HTML 4.0 Transitional' inside.

I would like LO to be able to save documents as HTML5. Use case: I would like to be able to insert an audio file into Writer document and have it in the form of HTML audio or video object:

<audio controls><source src="..." type="audio/mpeg"></audio>


Steps to Reproduce:
Open Writer, 'Insert' -> 'Movie and Sound' select an mp3 file, save document as HTML(5).

Actual Results:
Only wav files can be inserted as a media object, also they are only saved as an image in HTML.

Expected Results:
Audio file is inserted in the document (first of all as a link, but embeddeding into document might also be useful) and can be played from Writer and from web-browser when resulting HTML file is opened in it


Reproducible: Always


User Profile Reset: No



Additional Info:
I have tried inserting an audio object using menu 'Insert' -> 'Movie and Sound' specifying mp3 or m4a file, but it always reported that it does not support this file format. I believe that such popular formats as mp3 and m4a/aac should be supported