1732563 - Blurred rectangles pop up after scrolling down/up on www.zeit.de

Status: RESOLVED WORKSFORME

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

Description

[Viktor Jägersküpper]

Attachment: Screenshot with two blurred rectangles

OS: Arch Linux
Graphics: AMD Caicos with Mesa 21.2.2 (r600 driver)

Steps to reproduce:

• Go to https://www.zeit.de/wissen/gesundheit/corona-impfungen-deutschland-impffortschritt-aktuelle-zahlen-karte and click on "I agree" (visit the site with ads).
• Make sure that the mouse cursor is in the middle of the browser window (i.e. not near the left or right edge).
• Scroll down at least half of the page.
  -> At least one blurred rectangle pops up above/below the mouse cursor.
• After moving the mouse cursor a bit and scrolling down/up further, another blurred rectangle pops up.

This also happens on the homepage https://www.zeit.de, but it's easier to reproduce it on the subpage. I suspect that it has to do with the diagrams (on the homepage those about Covid-19).

This is a recent regression, I can reproduce it with hardware WebRender (default for me) and software WebRender (gfx.webrender.software enabled).

Mozregression gave the following result:
Last good revision: 25aecdb5f7918a5570e2e0f1a64649640cb800d4
First bad revision: 509b31169b3dc88b2c014b29368a743e2060b66d
Pushlog:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=25aecdb5f7918a5570e2e0f1a64649640cb800d4&tochange=509b31169b3dc88b2c014b29368a743e2060b66d

This is part of bug 1729894.

Comment 1

[Darkspirit]

It's the box that appears when you hover the "Anteil Geimpfte" diagram.
<div class="_1vDmJISr3Ol53LESINsnl3" has a backdrop filter.
If I set background-color to green and remove backdrop-filter, that box has a green background and the bug does not occur afterwards.
It's as if backdrop-filter would add some minimum-width and minimum-height to the element.
Can't reproduce the bug with Chromium 90.

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

The severity field is not set for this bug.
:jimm, could you have a look please?

For more information, please visit auto_nag documentation.

Comment 3

[BugBot [:suhaib / :marco/ :calixte]]

The severity field is not set for this bug.
:jimm, could you have a look please?

For more information, please visit auto_nag documentation.

Comment 4

[BugBot [:suhaib / :marco/ :calixte]]

The severity field is not set for this bug.
:jimm, could you have a look please?

For more information, please visit auto_nag documentation.

Comment 5

[Viktor Jägersküpper]

With bug 1769963 fixed, I enabled the backdrop-filter for testing and couldn't reproduce this issue any more, so I guess that it was fixed as part of bug 1749625.