1273463 - Hover on fixed position element triggers hover on non-positioned element behind it

Status: RESOLVED DUPLICATE of bug 1271714

(Core :: Layout, defect)

Description

[Jim Meyer]

Attachment: firefox_46_z_index_bug.html

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:47.0) Gecko/20100101 Firefox/47.0
Build ID: 20160512003946

Steps to reproduce:

The attached example works as expected in Firefox 45, Chrome, IE, etc.

It appears to be a a new issue introduced in Firefox 46. Also reproduced in 47 Beta 5.

In the example, hover over the items in the red box, top to bottom. Notice that even though the items in the red box are painted as being above all other items, the hover state on a non-positioned element in the body is triggered instead.


Actual results:

Can't click or trigger hover state on items inside the red box.


Expected results:

Same behavior as Firefox 45.

Comment 1

[quentin.le-delas]

Hello,

I have the same probleme with Bootstrap's popover with position fixed.

Comment 2

[Loic]

https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=2ec54b38a33da939a8255612999d9e867eb11664&tochange=bb5becd378f40a9be14e4e635d7034f2835fc7b5

Comment 3

[Markus Stange [:mstange]]

I've confirmed that the patch in bug 1271714 fixes this.