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[csswg-drafts] [css-align][css-inline] Be consistent about whether things have both baselines all the time, or what

From: Tab Atkins Jr. via GitHub <sysbot+gh@w3.org>
Date: Tue, 21 Jun 2016 22:09:21 +0000
To: public-css-archive@w3.org
Message-ID: <issues.opened-161551387-1466546960-sysbot+gh@w3.org>
tabatkins has just created a new issue for 

== [css-align][css-inline] Be consistent about whether things have 
both baselines all the time, or what ==
This is regarding #161 and #197.

So, Flexbox and Grid both define that that flex/grid containers always
 have baselines in both axises; if they don't have an appropriate 
child to generate one form, they just synthesize a baseline.  On the 
other hand, <https://drafts.csswg.org/css-align-3/#baseline-export> 
defines that a bunch of the other display types just don't have 
baselines in some axises.  This disparity is weird.

The baseline-alignment algorithms, similarly, tend to talk about doing
 alignment only in the inline axis, which seems... weird? A table 
should be able to baseline-align vertical-wm table headers with other 
vertical-wm cells in the same column; same for Grid, etc.  So we 
should rewrite the algorithms to let baseline alignment always happen 
in either axis when appropriate.  (Flexboxes can't baseline-align 
their children in the cross axis, as there's no semantic connection 
between items in different rows, but Grids certainly can.)

We already have text to make this work together well: 
<https://drafts.csswg.org/css-align-3/#baseline-terms> defines 
"baseline sharing groups" and "shared alignment contexts" based on WM 
and some related stuff so that those vertical-wm cells don't get 
aligned with horizontal-wm cells in their row just because they have 
spurious synthesized baselines in that axis.

So I think this is just a matter of fixing up a bunch of different 
bits of language (fairly exhaustively listed in Mats's two issues) to 
be consistent about how we talk about baselines and alignment.

Please view or discuss this issue at 
https://github.com/w3c/csswg-drafts/issues/211 using your GitHub 
Received on Tuesday, 21 June 2016 22:09:24 UTC

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