A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
Apparently MS improved the feature out of 2016.
But there is a simple, local workaround documented in this link:
https://www.youtube.com/watch?v=m3FWCkjX_jc
Basically, SAVE AS to PDF. In the PDF reader, SAVE AS to HTML. You may have to look around for a PDF reader that will do it for you. It looks like the one in the demo is Acrobat
Here is another demo that goes even further, describing how to create a functional web page ...