Currently, referencing a footnote multiple times creates duplicate IDs, which violates the HTML spec. A footnote can only have a backref to one reference:
foo [^3], bar baz[^3]
[^3]: lorem ipsum
Is there a way to reference a footnote multiple times, the way Wikipedia does? The footnote could render something like this:
3. a, b. lorem ipsum
Where a and b are backreferences to unique IDs that reference the same footnote.
Only being able to properly reference a footnote exactly once is a serious limitation.
I’m pretty sure the goldmark ‘Go’ package doesn’t use ‘PHP Markdown Extra’ under the hood. Instead, I’d bet money ‘PHP Markdown Extra’ behavior was used as the spec. At the time that was done, your quote:
I’m trying to work this backwards. If we can get the spec corrected, I suspect the goldmark maintainer may be more inclined to update the footnotes extension.