Sorry, no info concerning ConTeXT.
You don't have to use proprietary tools. An easy way to create ebooks
from Markdown files (or other sources) is Pandoc. https://pandoc.org/
I produce all of my ebooks in this way. In most cases they validate
without errors. If there are some errors though I use Calibre to fix
them manually.
Thanks, I didn't think of Pandoc, I'll give it a try. In the past,
I have tried to create some simple content (slides) with Markdown, but
my conclusion was that if you know TeX, it doesn't make sense to use
Markdown :)
Perhaps this is a silly question (excuse my ignorance about the topic):
what if you want to add some stylistic touches to your ebooks, such as
initials? Or Non-breaking spaces? How about adding, say, a text box with
a different background and a smaller font?
***
Or fine control page numbering, headers, footnotes, ligatures, or the
spacing between paragraphs, or center a separator as above? Do you need
to modify the generated CSS for that, or would ConTeXt (or Pandoc)
allow you to take care of (some of) those things?
Nicola
For Pandoc: Some things can be tweaked with pandoc, but for anything
that is a bit more advanced you'll probably need a custom CSS. For
special content you can use spans and divs. In your custom CSS you can
define how those elements should be rendered. Sounds pretty similar to
what Hans wrote in his response. Probably the main questions are if you
prefer to work with pandoc markdown or with ConTeXt sources, and if you
need additional output formats.
Denis
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