425432 - absolutely positioned elements offset by root's margin

Status: RESOLVED DUPLICATE of bug 243519

(Core :: Layout: Positioned, defect)

Description

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

Absolutely positioned elements that aren't inside another positioned element have their positions offset by the root element's margin.  This differs from the CSS 2.1 spec, I think (and IE7 and Safari).

Steps to reproduce: load http://dbaron.org/css/test/2008/abs-pos-cb/root-margin

Expected results: 4 colored boxes in the corners of the viewport

Actual results: top-left box is 100px from the corner of the viewport; the others require scrolling to see them.

Comment 1

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

Looks like bug 424710 is going to change the behavior here from one buggy behavior to another: it will make the top-right box 100px from the top right corner of the viewport, but still require scrolling down to see the two bottom boxes.

Comment 2

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

Maybe duplicate of bug 243519, but I can't tell.

Comment 3

[Daniel.S]

(In reply to comment #0)
> Steps to reproduce: load http://dbaron.org/css/test/2008/abs-pos-cb/root-margin

The current Windows nightly includes the patch from Bug 243519. The testcase mentioned above is in line with all other engines and Acid3 works as well now.

The patch has been backed out, but I think this is the evidence, that this bug is a dupe of Bug 243519 (or at least a problem fixed in that bug's patch).