Bug 16130

Summary: z-index applies to non-positioned elements with opacity
Product: WebKit Reporter: Ingo Chao <info>
Component: CSSAssignee: Dave Hyatt <hyatt>
Status: RESOLVED FIXED    
Severity: Normal CC: gavin.sharp, mitz, phiw2
Priority: P2    
Version: 528+ (Nightly build)   
Hardware: Mac   
OS: OS X 10.5   
Attachments:
Description Flags
testcase
none
Stop honoring z-index on objects that are not positioned. mitz: review+

Description Ingo Chao 2007-11-25 07:28:08 PST 
opacity < 1.0 forms a stacking context. But should z-index apply to an element that is not positioned? 

In the test case, opacity:0.66 and z-index:2 let a red box paint above a following blue box that has opacity:0.90 set. Not in Firefox 2.0.0.9.
Comment 1 Ingo Chao 2007-11-25 07:29:27 PST 
Created attachment 17505 [details]
testcase
Comment 2 Alexey Proskuryakov 2008-02-21 07:10:45 PST 
See also: bug 11905.
Comment 3 Dave Hyatt 2008-05-14 13:01:41 PDT 
Created attachment 21132 [details]
Stop honoring z-index on objects that are not positioned.
Comment 4 mitz 2008-05-14 13:06:25 PDT 
Comment on attachment 21132 [details]
Stop honoring z-index on objects that are not positioned.

r=me, please add a test case (using getComputedStyle if possible, or pixel test otherwise).
Comment 5 Dave Hyatt 2008-05-14 15:08:43 PDT 
Fixed in r33458.