Thanks for new idea
Interesting, what ODF standard tells about it?

I don't know if it's in the odf standard or not, it's basic html formatting, it's annoying to have the word processor dumber than simple common css rules

This is tricky because really we must abide by ODF standards. I'll mark as NEW as it's an interesting idea but when a dev looks at it they very well might say "it's not a standard" and that IS a valid response. 

That being said we might be able to do something internally, I'm not up to date enough on standards and our policies regarding standards to know.

Marking as NEW, Enhancement, Lowest

NEW (Confirmed)
Enhancement (already set)
Lowest (very few users would actually benefit from this, might not meet standards, somewhat difficult to implement)

Created attachment 71500 [details]
Document with paragraphs having round corners

This document contains round corners in paragraphs by using svg picture as background. It will be possible to write Basic Macro for automating this process. But it will not help much with exporting to HTML. Writer not even allows placing pictures behind of text.
And it will be helpful for developing to have well formatted HTML page with round corners as example of how it should be.