Comparing the HTML of version 6.8 with version 7.2, I see that many
classes got new names. This means that we essentially have to rewrite
our custom CSS file, which is not fun.
What about providing a script
```
texinfo-css-update --from 6.8 --to 7.2 < infile > outfile
```
that does the job, reporting conversion problems that have to be
resolved manually? There could also be an option `--compatible` to
allow the CSS file work for both an older and a newer `texi2any`
version.
Werner
PS: LilyPond provides the script `convert-ly`, which does exactly what
I've suggest above, namely to update syntax changes in different
LilyPond versions.
https://lilypond.org/doc/v2.25/Documentation/usage/updating-files-with-convert_002dly
