969064 - FIxed element rgba bug on gradient or box-shadow

Status: RESOLVED WORKSFORME

(Firefox for Android Graveyard :: General, defect)

Description

[Georgy]

Attachment: ff_rgba_bug.jpg

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:27.0) Gecko/20100101 Firefox/27.0 (Beta/Release)
Build ID: 20140127194636

Steps to reproduce:

I create fixed block (for examle menu), and add CSS styling with rgba color.

#header {
	background: #EEF2F7;
	border-bottom: 0.25em solid #0080C1;
	box-shadow: 0 1em 0.5em 0.5em rgba(255,255,255,0.8);
	display: block;
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	height: 3em;
	padding: 0;
	margin: 0;
}


Actual results:

After page load I see strange dark shadow instead of nice white fading.
When I start scrolling the page and Firefox toolbar is hidden off the screen, this bug disappears.	



Expected results:

I expect normal white transparent box-shadow for fading effect.
I also tried a trick with gradient in fixed element (for example: background: -moz-linear-gradient(top, rgba(255,255,255,0, 255,255,255,1)) and had the same bug.

Comment 1

[Aaron Train [:aaronmt]]

Which Firefox version on Android? Do you see this on desktop Firefox as well?

Comment 2

[Georgy]

Occurrence of the bug does not depend on the version of Firefox Mobile.
I use Firefox for Android about a year, and got this bug few times.

On desktop Firefox all is fine :)

I suspect that the error is related with toolbar...

Comment 3

[Georgy]

Now I have latest version of Firefox for Android — 27.0

Comment 4

[Aaron Train [:aaronmt]]

I think this is fixed in Firefox 28. I created a sample test-case: http://people.mozilla.org/~atrain/mobile/tests/bug969064.html and was not able to reproduce in Firefox Beta (28.0)+ 

I do see this in Firefox 27.

We're going to release Firefox Beta 28 on Google Play later today, perhaps you can try that out and let us know if that works out for you? Or you can try out Nightly (http://nightly.mozilla.org) or Aurora (http://aurora.mozilla.org) for Android as well.

Comment 5

[Georgy]

Just check it in Nightly and its great! There are no bug on Nightly :)
Thank you Aaron! I hope this this issue will be helpfull.

Comment 6

[Aaron Train [:aaronmt]]

Great, thanks for reporting. Firefox Beta 28 will be out today, and will be finished the beta period around March 18th.   
Fixed in Firefox 28.

Comment 7

[Ryan VanderMeulen [:RyanVM]]

WFM if the cause of the fix isn't known.