287233 - Combination of line-height and background-color can make border disappear

Status: RESOLVED DUPLICATE of bug 176237

(Core :: Layout: Block and Inline, defect)

Description

[Jeroen Ruigrok van der Werven]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.6) Gecko/20050225 Firefox/1.0.1
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.6) Gecko/20050225 Firefox/1.0.1

Given certain values of line-height in combination with a background-color can
cause a border-bottom to disappear.

Reproducible: Always

Steps to Reproduce:
1. Load the attached files.
2.
3.

Actual Results:  
The bottom border line disappears.  If one disabled the background-color of the
footer div the bottom border of the container div will be drawn.

Expected Results:  
Draw the outermost bottom border regardless of the line-height value.  

If you use, for example, 150% or 140% it will drawn it.  If the list items are
increased from 2 to 8 and the line-height is set to 130%, 160% or 180% it will
also drop the container div's border-bottom.

Opera 7.54 and 8 beta 3, Internet Explorer 6.0.2900.2180 all draw it as it should.
Netscape 7.2, Firefox 1.0.1 and the latest nightlies, Mozilla 1.8b all exhibit
this problem.

No Safari or Konqueror near to test.

Comment 1

[Jeroen Ruigrok van der Werven]

Attachment: testcase stylesheet

Comment 2

[Jeroen Ruigrok van der Werven]

Attachment: testcase HTML

Comment 3

[Jeroen Ruigrok van der Werven]

I am suspecting some rounding/math problem in the source given the correlation
between number of items and certain values of line-height.

Comment 4

[Jeroen Ruigrok van der Werven]

Attachment: Firefox 1.0.1 rendering

Comment 5

[Jeroen Ruigrok van der Werven]

Attachment: Opera 8 rendering

Opera 7.54 renders the same.

Comment 6

[Gary van der Merwe]

Attachment: More minimized Testcase

Comment 7

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

*** This bug has been marked as a duplicate of 176237 ***