130004 - z-index, CSS, dependant on positioning of elements

Status: RESOLVED INVALID

(Core :: Layout, defect)

Description

[nemo]

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.8+) Gecko/20020226
BuildID:    2002030111

3 elements.
first, z-index 1, position fixed
second, z-index 2
third, z-index 3, position fixed

instead of expected order of 1,2,3 based on z-index, actual display on screen is
2,1,3 with fixed elements above non-fixed

Reproducible: Always
Steps to Reproduce:
Click on attachment.  Look very carefully at difficult to view text.

Comment 1

[nemo]

Attachment: Test case

Comment 2

[Boris Zbarsky [:bzbarsky]]

From http://www.w3.org/TR/REC-CSS2/visuren.html#propdef-z-index:

  Applies to:  positioned elements

  For a positioned box, the 'z-index' property specifies: 

In other words, z-index does not apply to non-positioned content.  Try putting
position:relative on the "z-index:2" paragraph and you'll see that we handle
this correctly (putting a background on that <p> would really make the testcase
easier to use).  Marking invalid since we're following the CSS2 spec here.

Comment 3

[nemo]

cool.  wasn't certain if it was a bug.  read through the spec, but didn't note
that requirement.