243352 - divElement.style.MozOpacity property makes DIV disappear for any value but 1

Status: RESOLVED DUPLICATE of bug 228441

(Firefox :: General, defect)

Description

[Chris Holland]

User-Agent:       Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.6) Gecko/20040206 Firefox/0.8
Build Identifier: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.6) Gecko/20040206 Firefox/0.8

On this page:
http://home.earthlink.net/~hollandct/bugzilla/firefox/osx/mozopacity.html

you'll see that setting the opacity to anything but 1 (parseFloat on form input)
renders that layer fully transparent.

If you check that same URL in Mozilla or Netscape, it should work fine.

Reproducible: Always
Steps to Reproduce:
1. go to http://home.earthlink.net/~hollandct/bugzilla/firefox/osx/mozopacity.html
2. keep 0.5 value and hit return (or click button)
3. change value to 1 and hit return (or click button)
4. try out values from 0.0 to 1

Actual Results:  
DIV disappears when using anything but 1.

Expected Results:  
DIV should reflect various levels of opacity based on specified values.

I'm on Mac OS X Panther, 10.3.3 Build 7F44

Comment 1

[Chris Holland]

Attachment: HTML test case of divElement.style.MozOpacity CSS property

This attachment should also be accessible at:
http://home.earthlink.net/~hollandct/bugzilla/firefox/osx/mozopacity.html

Comment 2

[Mike Connor [:mconnor]]

Firefox 0.8 uses the same rendering engine as Mozilla 1.6.  There shouldn't be a
difference.

This is fine on a current trunk build on Win32.  Please try a current nightly
build as the build you are using is over three months old, from a branch created
nearly five months ago.

Comment 3

[Chris Holland]

thanks for your prompt reply :)

interestingly enough, my proof-of-concept works fine on an old version of Mozilla for OS X  (Mozilla 
1.3 Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.3) Gecko/20030312), as well as 
Netscape 7.1 for OS X. Which kinda baffles me. Pardon my ignorance, but does the Gecko rendering 
engine also control DOM scripting? i would assume it does. I've also tried it on Mozilla 1.5 for OS X and 
it also works fine.

I'll try and snag a nightly firefox build ... but something seems to be weird :\ :/. BTW, i downloaded 
firefox for OS X a couple of days ago.

thanks for your help!

-c

Comment 4

[Joseph Rosenblum]

this bug does manifest itslef in Mozilla 1.6 on Mac OS X. it's not just FireFox.
It was not manifest in release 1.5, so there seems that some sort of regresssion
occurred.

Comment 5

[Chris Holland]

OK, so apparently it's a bug in whichever version of Gecko used by Mozilla 1.6 on OS X. I've downloaded 
and installed Mozilla 1.6 for Win32 and my proof-of-concept works fine. So the bug appears to live on 
the latest OS X Gecko, but *NOT* on the latest Windows Gecko.

I probably should file this bug under mozilla then :\

Comment 6

[Chris Holland]

OK I have filed this bug in the main Mozilla/Style System (CSS) / OS X / Trunk:

http://bugzilla.mozilla.org/show_bug.cgi?id=243367

Joe, I've cc'ed you.

Comment 7

[Boris Zbarsky [:bzbarsky]]

1.6 is _so_ not "the latest Gecko"... ;)

1.6 was also the only Gecko "release" in which opacity on OSX was broken -- it
"worked" (insomuch as it worked at all) in 1.5 and actually works correctly on
all platforms in 1.7 builds and later.

*** This bug has been marked as a duplicate of 228441 ***