In trying to fix a problem with the thickness of the strikethrough line in "text-decoration: line-through" (via css classes, styles, <del> or <s>), I ran across posts saying to set the thickness of the line with text-decoration-thickness:
https://developer.mozilla.org/en-US/...tion-thickness
When I try in Calibre's editor (Calibre 6.3 and previous versions), it doesn't seem to do anything and when I run Calibre's Check Book, it gives me the error:
Unknown Property 'text-decoration-thickness'
for my stylesheet.css Running epubCheck has no problem with it. I assume Calibre should handle that property, so I'm reporting it here.
EDIT: Sorry. In 6.3, it looks like the text preview in the editor DOES reflect the thickness setting (it didn't in earlier version). But, Check Book is still giving the error.