398044 - position:absolute not fully honored on ::before (and ::after?) pseudo-elements

Status: RESOLVED DUPLICATE of bug 238072

(Firefox :: General, defect)

Description

[Ralph]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.2; es-ES; rv:1.9a7) Gecko/2007080210 GranParadiso/3.0a7
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.2; es-ES; rv:1.9a7) Gecko/2007080210 GranParadiso/3.0a7

::before pseudo-elements with 'position:absolute' don't honor the size given (i.e. width / height). If display:block is added the size is honored but the pseudo-element adds a "line-break" (even though it's absolute positioned). None of these issues happen on Opera 9.2 or Safari 3.0.3/Win.

See the url for an example (texts with red-dotted border).
Firefox 2.0.0.7 / 3a7 give the same result.

Reproducible: Always

Steps to Reproduce:
1-a. Add the few next CSS rules to an element (e.g. an li)
     li::before {
       content:  'any content';
       position: absolute;
       width:    20ex;
     }
1-b. Add the following rule to the same pseudo-element
       display: block;
Actual Results:  
1-a. The ::before pseudo-element ignores the size given
1-b. The ::before pseudo-element honors the size, but adds a "line-break" after it

Expected Results:  
1-a. The given size is honored.
1-b. The given size is honored and no "line-break" is added.

The expected results mentioned before are actually achieved on Opera 9.2/Win and Safari 3.0.3/Win

about:buildconfig

Build platform
target
i686-pc-cygwin

Build tools
Compiler 	Version 	Compiler flags
$(CYGWIN_WRAPPER) cl 	14.00.50727 	-TC -nologo -W3 -Gy -Fd$(PDBFILE)
$(CYGWIN_WRAPPER) cl 	14.00.50727 	-GR- -TP -nologo -Zc:wchar_t- -W3 -Gy -Fd$(PDBFILE)

Configure arguments
--enable-application=browser --enable-update-channel=beta --enable-optimize --disable-debug --disable-tests --enable-update-packaging --with-branding=browser/branding/unofficial

Comment 1

[philippe (part-time)]

positioning is not yet supported for generated content (::before and ::after).