In some cases there is a long string of note marks (aka references) and they make it slightly harder to read the text. In content text they are a sufficient seldom occurrence that they are not that much of a problem, but should be solved somehow. If we try to reuse references in the infoboks, then the number of note marks can be quite high.
I have been experimenting with collapsing the note marks into a single common one. Clicking (or hovering) on that opens a small toolbar with the other note marks. This does not work very well when a popup note is used for the citation, as it will stack two popups on top of each other. It would probably be better to list the notes for each citation in one and the same popup, probably as a scrollable list.
In my experiments a sequence like <sup></sup><sup></sup><sup></sup> would be rewritten as <sup>[†]</sup> and with an additional toolbar with <div></div>. In some of my experiments a single <sup></sup> was turned into <sup>[†]</sup> and multiple <sup></sup><sup></sup><sup></sup> was turned into <sup>[‡]</sup>. Both forms are shown in Figure 1, and in Figure 2 a reference toolbar is shown.
Figure 1: Text without open ref toolbar
Figure 2: Text with open ref toolbar
I have also experimented with removing the square brackets to make it even less disturbing. That made it a bit to small to hit with a pointing device, and I had to enlarge the clickable area.
This is now part of a discussion at nowiki, but the community is made aware of the fact that the current Reference Preview does not support this style of encapsulating several note marks. Not sure if this is a real issue for anyone outside nowiki…