My goal is to export SVG files of TikZ drawings in HTML.  Now, what follows
is a bit of a rant on `org-babel-execute:latex`; let's go through the
options:

- You're exporting to PNG without imagemagick:
This uses `org-create-formula-image` which works really well, but it
discards the options of the LaTeX block (fit, width, height, ...),
including headers.  It also fails to *force* using 'dvipng as processing
type, so if `org-preview-latex-default-process` has been changed, it may be
confusing.  Finally, it uses `in-buffer` to render LaTeX as if it were in
the buffer, which is not what the user would want since they are exporting
to html (as a result, I get a black background on my pictures, since my
buffer background is black).

- You're exporting to PNG with imagemagick or to PDF:
This may work.  Sadly, "#+LATEX_HEADER:" is ignored, though it is in the
previous case.

- You're exporting to HTML.  This uses htlatex—it's very rarely functional,
but eh, you asked for TeX to HTML, and pdf2htmlEX seems unmaintained, so
expect chaos.

- You're exporting to SVG.
This… uses htlatex?  Why in paradise?  org-create-formula-image would do
that *brilliantly.  *In any case, I can't seem to make it work: my fonts
are always disappearing.

So what do I do?  I use the attached patch, that bypasses `htlatex` and
uses the oh-so-working `org-create-formula-image`.  This, of course, is not
a complete solution—this whole function is messy at best, buggy at
worst—but in the meantime, I can finally export my pictures to SVG (end
result: https://autoboz.org/open-problems/19.1-ccra/).

If anyone has an opinion on what to do with this situation, I'd be happy to
help.

Cheers,
M.