@ToddTrimble I suppose that you wanted to use [meta-tag:markdown-preview] rather than [tag:markdown-preview]. (The current text of the comment links to the main site rather than to meta.
Of course, as a mod you have the advantage that you have no time limit on editing the comments. :-)
@YCor The syntax for tags is [tag:tagname]tagname and for meta [meta-tag:tagname]tagname - it is the same as in the posts. (It probably does not work in rooms which aren't associated with any site. That is most likely explanation why it did not work in the sandbox.)
I am familiar with (most of the) contents of Angelo Vistoli's notes on Descent theory (Stacks). I am also comfortable with basics of Schemes, their Cohomology (Cech), from Hartshorne's Algebraic geometry.
Now, I am interested to learn some basics on Moduli space/ Moduli problem/ Moduli stacks.
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@MartinSleziak Should we really encourage multiplication of such meta tags? I'd prefer keep the specific tags in such a case, and keep the generic reference-request.
@YCor Well, apparently the tag exists since 2015 - and if there were some objections about it, I have missed thim.
Admittedly it is rather small - 7 questions now, 6 questions in September. It's possible that people did not object to it simply because many users did not notice the tag.