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Re: [csswg-drafts] [css-inline-3] Propose N/A value for em-top and em-bottom baselines (#5380)

From: Koji Ishii via GitHub <sysbot+gh@w3.org>
Date: Sun, 09 Aug 2020 15:35:24 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-671066420-1596987323-sysbot+gh@w3.org>
The last part of my comment above was incorrect, sorry. Correction:
> @jfkthame:
> > In my mind, at least, em-top and em-bottom are expected to provide the alignment positions used by Canvas2d textBaseline=top and bottom, so they can't be undefined or zero or whatever.
> Blink uses [text-over](https://drafts.csswg.org/css-inline-3/#text-over-baseline) and [text-under](https://drafts.csswg.org/css-inline-3/#text-under-baseline) for them today

Blink used to use text-over and text-under, switched to the logic you suggested in https://github.com/whatwg/html/issues/2470, but WebKit did not agree, so we're still not interoperable.

I don't know whether WebKit is happy with this new logic or not, but this new logic does not work well for Blink.

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