Positioning of punctuation marks

[xfq]

In § 3.1 Line Composition Rules for Punctuation Marks:

Punctuation marks are usually center-aligned in the character frame in Taiwan and Hong Kong, while punctuation marks are positioned in the corner of the character frame on the side closest to the preceding text in the Chinese Mainland.

Strictly speaking, this is not true. In Mainland China, periods and commas are in the corner, while exclamation marks and question marks are not. While colons and semicolons are on the side closest to the preceding text, quotation marks and brackets are not.

[r12a]

Colons and semicolons are, iiuc, slightly more complicated still, because they aren't rotated so the side doesn't equate to 'closest to the preceding text' in vertical mode. And middle dot is always centred, iiuc.

(Fwiw, see my attempt at characterisations at https://r12a.github.io/scripts/han/#phrase and https://r12a.github.io/scripts/han/#quotations)

Since the intent here is, iirc, to indicate that things may vary, rather than to itemise which punctuation behaves in which way, perhaps a way around it is to say: "Punctuation such as full stops and commas are usually center-aligned in the character frame in Taiwan and Hong Kong, while they are positioned in the corner of the character frame on the side closest to the preceding text in the Chinese Mainland."