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[css 2.2] [tables] Baseline on empty table cells

From: Robert Hogan <robhogan@gmail.com>
Date: Fri, 31 Jul 2015 19:19:09 +0100
Message-ID: <CAD1xn+P9aa1eo6YUQ3=93mJMJ=5Ww8zC4zSS0Rnz+91n0DnO6w@mail.gmail.com>
To: David Baron <dbaron@dbaron.org>, www-style list <www-style@w3.org>, mstensho+blink@opera.com, GĂ©rard Talbot <css21testsuite@gtalbot.org>
Hi there,

We've hit a bug in Blink while trying to confirm to
http://test.csswg.org/harness/test/css21_dev/single/inline-table-valign-002/.
It
comes down to what height we should give the second cell box in:

<!DOCTYPE html> <style> .cell{ height:453px; vertical-align: baseline; }
</style> <table> <td class="cell"> crbug.com/513319: An empty cell even if
it has height should set the baseline for the row. This text should be at
the top of the page. </td> <td class="cell"> </td> </table>

Everyone gives it a height of 453px but only FF and Blink currently put the
baseline on the bottom of the cell. (If you put an empty <div> in the
second cell then FF puts the baseline at the top (i.e. below top border and
padding). I'm guessing it does this because the empty div has an empty
linebox.)

Turning to the spec: "The baseline of a cell is the baseline of the first
in-flow line box in the cell, or the first in-flow table-row in the cell,
whichever comes first. If there is no such line box or table-row, the
baseline is the bottom of content edge of the cell box." So with a height
of 453px, it looks like the baseline should be down at the bottom of the
cell like Blink and FF do.

But it's very hard to get away from : "The table cell's 'height' property
can influence the height of the row (see above), but it does not increase
the height of the cell box." (This is a recentish addition,
https://lists.w3.org/Archives/Public/www-style/2010Jun/0048.html)

Accepting that the bottom content edge of the cell is not determined by the
computed height of the cell means that
http://test.csswg.org/harness/test/css21_dev/single/inline-table-valign-002/
is wrong. It looks like that test and FF (and us until we revert) are
wrong.

Is there something I'm missing?

Thanks,
Robert
Received on Friday, 31 July 2015 18:19:38 UTC

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