{margins}, {indentation}, and changing the "margins" in the middle of a page

Question

Perusing margins and indentation, I've noticed that these two tags in fact cover at least three concepts:

1. Changing the (top/bottom/left/right) margin(s) for a whole document or at least for a whole page. This is the rightful domain of margins, often accompanied by the geometry and/or typearea (package) tags.

2. Switching on/off first-line indentation for all or specific paragraphs. This is covered by indentation. (I'm not aware of any package-specific tags, though the indentfirst package would fit in.)

3. Changing the (left/right) "margins" in the middle of a page, e.g. for lists, quoting environments, and theorems. Questions concerning this matter feature either margins or indentation or both tags, with no discernible pattern.

I think we should come to an understanding to which tag questions of the third type belong -- margins, indentation or even a yet-to-be created new tag. I suggest that indentation is in fact the appropriate tag, and ask you to advance your opinion.

(Note: From the 30 highest-scoring margins questions, 4 belong to the "middle-of-the-page" type. Assuming about the same fraction for the whole tag, adoption of my proposal would mean the necessity to retag about 20 to 30 questions. It is possible that Stefan Kottwitz, owner of the sole margins tag badge, would lose this badge at least temporarily. Assuming that at least 100 margins question would remain, the tag badge would not be destroyed, but "orphaned" the same way as it happened for the memoir badge.)

Answer 1

As my proposal has gained 4 upvotes, I will begin to retag the " middle-of-the page" type questions from margins to indentation. I suggest the following wiki excerpt for margins:

{margins} is about changing the margins of (whole) pages and, conversely, the width and height of the textblock and its positioning on the page. Popular packages are {geometry} and {typearea}. For changing the "margins" in the middle of a page, use {indentation} instead.

Note, however, that tex.sx features exactly 40 tags with more than 200 questions right now and margins is likely to fall below this mark. This in turn may affect the process of awarding "Generalist" badges. Because of this, retagging will only be completed as soon as another tag (possibly installing, amsmath, or footnotes) exceeds 200 questions.