1610304 - Unwanted element disappearance on hover

Status: RESOLVED DUPLICATE of bug 1585626

(Core :: Web Painting, defect)

Description

[Gabor]

Attachment: disappearance.gif

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:72.0) Gecko/20100101 Firefox/72.0

Steps to reproduce:

1. Go to this page:
   https://smartslider3.com/split-slider/
2. Put your cursor into the white part, at the Luxury Cabin part.
3. Scroll down (to trigger slide switching).
4. Move your cursor to the top menu "Projects" menupoint.

(I'm attaching a gif recording about it.)

Actual results:

Elements are disappearing because of this CSS code being on the parent:
.n2-ss-slider .n2-ss-static-slide {
visibility: hidden;
}

Expected results:

Elements shouldn't disappear, because even if the parent has visibility: hidden; the lower child elements have visibility: visible;

Also there are no hover based triggers.

Comment 1

[Augusto Pace]

Hi,

I was able to reproduce this issue on Windows 10 with Firefox version 74.0a1 (2020-01-24) (64-bit) - Beta 73.0b8 (64-bit) - Release 72.0.2 (64-bit). Marking those flags as affected.
Also I set the component to Core - CSS Parsing and Comp.

Comment 2

[Emilio Cobos Álvarez (:emilio)]

This is a painting issue, not a style engine issue. It seems like there's some z-sorting / invalidation issue... Miko is this something you can take a look?

It'd be good to know whether this is a regression. I can repro this with WebRender too.

Comment 3

[Alice0775 White]

Regression window:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=365ff23dd4c93ef26743e3fa339b5fac3bf15b66&tochange=2bf6bddf9a8a5c52222273ee787bfca7e6c97394

Comment 4

[Miko Mynttinen]

I think the root cause is the same as with bug 1585626.