1337644 - Position fixed is behaving like position absolute in the latest version of Firefox

Status: RESOLVED INVALID

(Core :: General, defect)

Description

[Adam Ziman]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.95 Safari/537.36

Steps to reproduce:

I have a nav item setup to be a fixed position at the top of the browser so that when the user scrolls down the page it stays with them. This is working on all other browsers except for the latest version of firefox (works on older versions). 


Actual results:

The nav behaves like it has been set to position: absolute


Expected results:

It should stay in a fixed position

Comment 1

[Loic]

Could you provide a simple testcase.

Comment 2

[Adam Ziman]

I can't provide a full example because the site is still in production however here is a screen shot.

Comment 3

[Adam Ziman]

Attachment: Screen Shot 2017-02-08 at 2.29.50 pm.png

You can see that the nav container has position fixed however it is behaving like position absolute

Comment 4

[Loic]

We don't need the full website, just a reduced testcase on https://jsfiddle.net/ or http://codepen.io/

Comment 5

[Adam Ziman]

I have actually figured out what the issue was. It looks like when you have -webkit-perspective: 0; in the latest version it breaks the position fixed attribute.

Comment 6

[Firefox Bug Husbandry Bot]

Moving from Core::Untriaged to Core::General https://bugzilla.mozilla.org/show_bug.cgi?id=1407598