985374 - in MAC version of firefox, the CSS classes applied to the element not simultaneously

Status: RESOLVED INCOMPLETE

(Core :: Layout, defect)

Description

[Norman Szigeti]

User Agent: Mozilla/5.0 (X11; Linux i686 on x86_64; rv:28.0) Gecko/20100101 Firefox/28.0 (Beta/Release)
Build ID: 20140314220517

Steps to reproduce:

1.) I have created a CSS class what animates the top position changing of an element
2.) I have created another class, what hides the element using negative top values.
3.) I have created a javascript what inserts an element to the DOM with both classes.


Actual results:

First, the element becomes visible, and then immediately goes away animated


Expected results:

In the Linux version, the element does not become visible at all.

I think it is the expected result, because the resulting style (the combined effect of the two classes) defines the negative top value.

It seems the MAC version of Firefox applies these classes not simultaneously. (applies them in order instead of applying the resulting style one time)

Comment 1

[:Gijs (away/busy until Mar 10)]

Can you provide your testcase?

Comment 2

[:Gijs (away/busy until Mar 10)]

I don't think there's a whole lot we can do here without a testcase / more details.