269746 - Containing box for absolutely positioned element wrong when no positioned ancestor

Status: RESOLVED DUPLICATE of bug 243519

(Core :: Layout, defect)

Description

[David "liorean" Andersson]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0

Mozilla gets the contaning box wrong for absolutely positioned elements when the
element haven't got any positioned ancestor. It uses root instead of the initial
containing box, which means that a border on the root offsets tbe absolutely
positioned element, when in fact it should be positioned relative to the box
within which the root element and it's border is drawn.

Correct behaviour would have the fixed positioned element and the absolutely
positioned element in the same place when the testcase is top scrolled.

Reproducible: Always
Steps to Reproduce:

Comment 1

[Boris Zbarsky [:bzbarsky]]

Note that this changed in the spec from CSS 2.0 to CSS 2.1.  We haven't had a
chance to implement the 2.1 version yet.

*** This bug has been marked as a duplicate of 243519 ***