231050 - Fixed elements with a negative z-index are rendered behind page background

Status: RESOLVED DUPLICATE of bug 78087

(Core :: Web Painting, defect)

Description

[Jail]

User-Agent:       Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.5) Gecko/20031026 Firebird/0.7
Build Identifier: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.5) Gecko/20031026 Firebird/0.7

If I set an element's CSS z-index property to -1 and position property to fixed
 (tested with img tag), the image is rendered behind the page background.

That is, it's invisible, but I know it's being drawn because the image is a
large transparent png (watermark, width and height of 100%), and slows scrolling
down a fair bit.

In both Safari and Internet Explorer 5:mac, the image is rendered behind the
page content, and above the page background, in all the mozilla browsers on my
hd, it's rendered behind the page bg.

Sorry I don't have an example page, I haven't uploaded my revamped site yet.

Reproducible: Always

Steps to Reproduce:
I'll repduce the bug in mozilla composer, since wysiwyg is simple.

1. Create a new web page in mozilla composer (I'm using moz 1.5 btw)
2. Click the Image toolbar button and select an image (I've just used a jpg
desktop picture), click the Advanced Edit... button followed by the "Inline
Style" tab, add these two properties: "z-index: -1" and "position: fixed"
3. Click OK, click OK again (bad ui design btw).

Actual Results:  
Image is behind the page background, but still there. You can see the image
handles and everything.

Expected Results:  
Image should be behind the page content, but above the background.

Comment 1

[Jesiah S]

*** This bug has been marked as a duplicate of 78087 ***