I expect my viewpoint on this is idiosyncratic, but I really quite like hoverable-footnotes, and quite dislike side-notes. I find side-notes problematically distracting.
I think another option that isn’t mentioned is to put everything that’s ‘extra’ in an appendix, with no tie-ins from the text. Then, in the appendix, quote the bit of the main article which this extra note is relevant to. That seems even less distracting to me.
I expect my viewpoint on this is idiosyncratic, but I really quite like hoverable-footnotes, and quite dislike side-notes. I find side-notes problematically distracting.
I think another option that isn’t mentioned is to put everything that’s ‘extra’ in an appendix, with no tie-ins from the text. Then, in the appendix, quote the bit of the main article which this extra note is relevant to. That seems even less distracting to me.