>> I have a problem with the EB Garamond family: it contains the glyph
>> "ͤ" (U+0364, COMBINING LATIN SMALL LETTER E), however, it has
>> neither an anchor point nor is it part of the font's "mark" table –
>> in particular, I need support for the combination "oͤ", as used in
>> old German texts.
>>
>> To fix this, I would like to use `fonts.handlers.otf.addfeature`.
>> Is there an example somewhere how to do that? I could only find
>> samples for other, simpler GSUB and GPOS lookup types but nothing
>> for "marktobase", which is needed here. In case there is
>> documentation already available please give me a link.
>
> it should be helpful if you add small example (even if it does not
> do what you need) to have a bit of context.
Here it is, using current git of TeXLive. The attached images show
the current and desired results.
```
\documentclass{article}
\usepackage{ebgaramond}
\begin{document}
gehoͤrt
\end{document}
```
> Perhaps the pair feature as in
> https://articles.contextgarden.net/journal/2017/27-76.pdf
I've seen this already, thanks, but the structure of the 'marktobase'
feature is completely different.
Werner
