Bug 249924 – WebKit only distributes extra table-height to tbody rows -- not to thead/tfoot rows

• Status: NEW
• Component: Tables

[Daniel Holbert]

STR:
(1) Load either of these testcases:
Table using CSS styling: https://bugzilla.mozilla.org/attachment.cgi?id=9310034
Table using HTML parts: https://bugzilla.mozilla.org/attachment.cgi?id=9310036


EXPECTED RESULT:
The rows should all be the same height.

ACTUAL RESULT:
The header/footer rows are only as tall as their content.



The css-tables-3 spec "height distribution algorithm" says (in its last paragraph) to distribute any extra available height equally among all rows.  There's no exception for rows that are in header/footer groups.
Link:  https://drafts.csswg.org/css-tables-3/#height-distribution-algorithm

Blink has the same behavior as WebKit here, but probably just because this is a legacy WebKit table behavior that Blink inherited.

All other browser engines -- Gecko (Firefox), EdgeHTML (Edge 16), Trident (IE11), and Presto (pre-Blink Opera) -- distribute the height equally among all the rows, including the header/footer rows.  And that seems to be what the spec calls for, as well.

Blink version of this bug report:
https://bugs.chromium.org/p/chromium/issues/detail?id=1403995
This was also originally filed as a Firefox bug:
https://bugzilla.mozilla.org/show_bug.cgi?id=1806961
(but as noted above, Firefox seems to be spec-compliant, and WebKit-derived rendering engines seem to be the odd ones out here; hence I've closed that bug as invalid and filed these Blink/WebKit bugs.)

[Karl Dubost]

Thanks Daniel!

Probably it would be good to have a WPT test for this bug.

[Radar WebKit Bug Importer]

<rdar://problem/103882236>