Limitations
Multiple references per footnote
As highlighted in issue #83, it is currently not possible to have multiple references pointing to the same footnote.
The main reason why this is not possible is because the premise is to leverage CSS counters for numbering in order not to have to maintain a bunch of indexation logic. That means every single reference ends up incrementing the counter by 1, which makes shared references impossible.
There is a proof-of-concept in pull-request #104 to make it possible, but it adds a lot of complexity to the core library so was never merged.