411083 - Wrong rendering when padding is 0

Status: RESOLVED INVALID

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

Description

[Ivan G Shevchenko]

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en; rv:1.9b3pre) Gecko/2008010604 Minefield/3.0b3pre
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en; rv:1.9b3pre) Gecko/2008010604 Minefield/3.0b3pre

When padding is 0 instead of 0.01em, some elements are rendered totally different - see screenshots and testcases.

The only difference between both testcases is:
Some elements in the file 2008-01-07-padding-correct.xhtml have padding 0.01em, while in the file 2008-01-07-padding-wrong.xhtml same elements have padding 0.


Reproducible: Always

Steps to Reproduce:
1.
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Comment 1

[Ivan G Shevchenko]

Attachment: testcase - rendering of padding is correct

Comment 2

[Ivan G Shevchenko]

Attachment: screenshot - rendering of padding is correct

Comment 3

[Ivan G Shevchenko]

Attachment: testcase - rendering of padding is wrong

Comment 4

[Ivan G Shevchenko]

Attachment: screenshot - rendering of padding is wrong

Comment 5

[Ivan G Shevchenko]

well, this is strange:
opera 0.24 renders the 'correct' testcase also in a 'wrong way'. but increasing padding to 0.1em (remember: the 'correct' test case has 0.01em) makes rendering correct.

or are both browsers doing it right and this is again one of those css box model's mysteries, that only gods understand? ;)

Comment 6

[Mats Palmgren (inactive)]

"... adjoining margins (no non-empty content, padding or border areas or clearance separate them) of two or more boxes (which may be next to one another or nested) combine to form a single margin. "
http://www.w3.org/TR/CSS21/box.html#collapsing-margins

When you introduce a non-zero vertical padding you prevent margin collapsing
from happening through that padding.

-> INVALID