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Re: [csswg-drafts] [css-inline-3] Define em-top and em-bottom baselines (#5312)

From: fantasai via GitHub <sysbot+gh@w3.org>
Date: Fri, 31 Jul 2020 14:42:51 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-667155712-1596206570-sysbot+gh@w3.org>
> central is defined as "halfway between the ideographic-under and ideographic-over baselines", so it will never be defined without iTop and iBottom, correct?

Depends on the font format, some formats have an explicit ideographic-central baseline.

> emHeightAscent and emHeightDescent, not fontBoundingBoxAscent and fontBoundingBoxDescent, correct?


> Maybe we suggest HTML Canvas to add horizontal and vertical metrics?

I guess that's an issue for Canvas API :) In CSS we would use the correct set depending on writing-mode...

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