242502 - visibility: collapse do not collapse COLGROUP

Status: RESOLVED WORKSFORME

(Core :: Layout: Tables, defect)

Description

[Gérard Talbot]

While checking a few things about bug 76497, I noticed that colgroups do not get
collapsed nor get hidden. Note that MSIE 6 for Windows will hide a colgroup
thanks to the css rule 
#idColgroup {visibility: hidden;}

Mozilla 1.8alpha 2004050108 under XP Pro here.

Simple testcase coming up.

Comment 1

[Gérard Talbot]

Attachment: Simple testcase

Expected results: 
2nd colgroup should get hidden while the 4th colgroup (which has 3 columns)
should get collapsed.

Actual results I get with 1.8a build 2004050108: 
2nd colgroup is visible while 4th colgroup gets hidden.

Comment 2

[Bernd]

could you please explain why it should be hidden. I can see collapsed in  the
CSS2.1 spec but not hidden.

Comment 3

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

visibility:hidden should have no effect on columns or column groups.

Comment 4

[Bernd]

I think thats a border collapse painting issue. The columns collapse only the bc
code paints the old borders

Comment 5

[Gérard Talbot]

Sorry about that. I thought visibility: hidden should have an effect on col and
colgroups. I modified the summary to reflect that change.

Comment 6

[Gérard Talbot]

Attachment: Corrected testcase

Comment 7

[Gérard Talbot]

I'm resolving this bug as WORKSFORME since bug 242997 and bug 242998 better
describe and better explain what needs to be done and what the problem is.