Positioning of : and ; in Chinese

[r12a]

This question arose after reading https://www.w3.org/TR/css-text-4/#fullwidth-ambiguous

I've been trying to figure out how fullwidth colon and semicolon are rendered in Chinese & Japanese, mostly by applying various fonts to text on my Mac. So far i have come to the following conclusions:

Japanese
centred horizontally in horizontal text
rotated and centred vertically in vertical text

Simplified
left-aligned in horizontal text
right-aligned and upright in vertical text

Traditional
centred horizontally in horizontal text
centred horizontally in vertical text

(In each category there is the odd font that deviates from all the rest. In particular, Noto fonts for TC keep the characters upright and right-aligned in vertical text.)

Is this correct? Is it oversimplified?

[bobbytung]

Hi Richard
Colon and semicolon in Traditional Chinese keep centred horizontally in both horizontal and vertical writing.

[r12a]

Thanks, @bobbytung. I just realised that i did the testing in my chinese character app, but forgot to change the language of the text box. Setting it to zh-hant does make a difference to the rendering of the Noto fonts, so i'll redo the tests.

[xfq]

See also: https://www.w3.org/2020/05/07-clreq-minutes.html#t05

[acli]

This is incorrect. Traditional Chinese prefers centred only in Taiwan. In Hong Kong there’s, AFAIK, no preference.

[xfq]

Link to yesterday's discussions: https://www.w3.org/2020/09/16-clreq-minutes.html#t11

[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

I suggest to close this issue since we didn't say punctuations in Hong Kong must be positioned in the vertical and horizontal center of the character frame.