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Re: [csswg-drafts] [css-inline-3] Ascent and Descent Metrics in vertical flow (#5381)

From: Nat McCully via GitHub <sysbot+gh@w3.org>
Date: Sun, 16 Aug 2020 16:02:35 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-674544549-1597593754-sysbot+gh@w3.org>
> Mongolian is implemented in current mainstream fonts as a LTR horizontal script, and the glyphs expect 90-degree clockwise rotation in vertical lines. This is the result of that Mongolian script’s de facto fallback form in horizontal lines is expected to be 90-degree counterclockwise rotated from its normal vertical form, which is different from CJK’s expected behavior.

This would imply a glyph origin of left side and Roman baseline. Is there a preferred way to calculate the baseline offset from origin in vertical layout? The CJK baseline For Japanese vertical being embox center means layout engines calculate the center baseline as an offset from the glyph origin in order to properly position glyph runs on f different sizes in vertical. What are the conventions for Mongolian?

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