599103 - right-most table borders not showing for some cells, border-collapse issue

Status: NEW

(Core :: Layout: Tables, defect)

Description

[Judy]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.7) Gecko/20100713 Firefox/3.6.7 ( .NET CLR 3.5.30729; .NET4.0C)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.7) Gecko/20100713 Firefox/3.6.7 ( .NET CLR 3.5.30729; .NET4.0C)

Some of the borders on the right side of a table are (sometimes) missing.
Reloading the page sometimes brings the borders back again. 

My case has just one table, no nesting. Different widths do not matter. 
I do not use colspan or rowspan.
The page works fine in IE8. It fails --sometimes-- in Firefox.

Firefox is 3.6.7 
Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.7)
Gecko/20100713 Firefox/3.6.7 ( .NET CLR 3.5.30729; .NET4.0C)

Doing a page-refresh usually fixes it, but not always.

If I use firebug to turn border-collapse off, then on again, the problem is cured.

I started firefox in safe mode and got the same failures.

This problem does not occur when serving my page from my development machine
which is Windows 7 Pro, using IIS to serve.
The problem DOES happen when serving my page from the production server,
which uses Apache 2.2.13, Linux Kernel version 2.6.18-194.11.3.el5 
(The production machine hosts my page, but is not my machine).

Reproducible: Sometimes

Actual Results:  
some cells right-most borders not drawn

Expected Results:  
All table borders should show.

Comment 1

[Judy]

Attachment: screenshot

even short tables (3 rows) can display the problem.

Comment 2

[Judy]

Attachment: screenshot2 longer table

longer table (21 rows) also shows problem

Comment 3

[Boris Zbarsky [:bzbarsky]]

Is this an issue in Firefox 4 betas?  That code has been changed since 3.6, iirc.

Comment 4

[Judy]

Attachment: screenshot - run on FF 4.6.

Alas. Still fails on FF4.6 Beta:
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b6) Gecko/20100101 Firefox/4.0b6
I am trying to trim down a test case. The sporadic nature of this makes it keep moving out from under me.

Comment 5

[Judy]

Attachment: testcase

This testcase fails almost consistently on FF 3.6.10. It does not fail on FF 4.6 after several tries. However, other tables constructed in php on this same pattern do fail on FF4.6 in exactly the same way. If you load the testcase repeatedly, it may "cure" or it may show different table cell borders missing or it may still fail just as originally.

Comment 6

[Aleksei Perepelkin [:chaos]]

Attachment: Testcase with bug reproducing by interaction