1318439 - intrinsic width of table that contains a 100% width cell and other things should be infinite, but isn't

Status: UNCONFIRMED

(Core :: Layout: Tables, defect)

Description

[Thomas Etter]

Attachment: Minimized example showing the issue in FF, but not in Chromium

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:49.0) Gecko/20100101 Firefox/49.0
Build ID: 20161025170457

Steps to reproduce:

Open the attached minimized example.
Tested on
Firefox 49.0.2
Firefox Developer Edition 51.0a2 (2016-11-14) (64-bit)
Firefox Nightly 53.0a1 (2016-11-17) (64-bit).
Firefox for Android Beta 50.0b12


Actual results:

The outermost divs (blue and red) keep the same width as if the yellow one did not have width set, which you can verify by toggling the "width: 100%" in the element inspector/firebug.

Also if the "position: fixed" is removed from the blue, the expected behavior appears.


Expected results:

The blue, the red and the yellow div should be stretched to fit the width of the viewport.

Comment 1

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

Attachment: slightly simpler testcase

Comment 2

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

Presumably this relates to how we compute the intrinsic preferred width (PrefISize) of the table.  I think we should be reporting an infinite result in this case, but we don't seem to be.

Edge matches Chromium.