1805879 - Abnormal display when backdrop-filter and position:absolute

Status: RESOLVED FIXED

(Core :: Graphics: WebRender, defect, P3)

Description

[代其杰]

Attachment: backdrop-filter bug test.html

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:107.0) Gecko/20100101 Firefox/107.0

Steps to reproduce:

Change the background color of an backdrop-filter element to opaque.

Actual results:

Elements of the underlying layers were unexpectedly revealed.

Expected results:

Lower elements should be occluded.

Comment 1

[代其杰]

I've been looking forward to using backdrop-filter. It was discovered in one of my own game-related projects.
Normally displayed in normal cases.
http://storage.live.com/items/BF825EF87FCF7361!76714:/1671105290807_firefox.png
When I enter "Guide Mode" and set the background to opaque, a display error occurs.
http://storage.live.com/items/BF825EF87FCF7361!76713:/1671105311928_firefox.png

You can see the content directly through my test data:
https://mapaler.github.io/PADDashFormation/solo.html?guide=1&id=9517&d=%7B%22d%22%3A%221234%25%7Bl48%7D%25%7Bl48%7D%25%7Ba105%7D%25%7Ba95%7D124%25%7Bm9517%7D23%25%7Bm1005%7D4%22%2C%22f%22%3A%5B%5B%5B%5B9517%2C120%2C9%2C99%2C%5B48%5D%2C48%5D%5D%2C%5B%5D%2C1%5D%5D%2C%22v%22%3A5%7D

Comment 2

[Sotaro Ikeda [:sotaro]]

:gw, can you comment to the bug?

Comment 3

[Nikolay Bryskin]

I have a very similar bug described here

Comment 4

[代其杰]

Supplemental:

When I use the built-in screenshot feature, the backdrop-filter loses its effect.

Comment 5

[Mayank Bansal]

This is fixed now.

Fix range:
Bug 1800358 - Fix invalid scroll root selection in some cases. r=gfx-reviewers,jrmuizel