1895735 - CSS 3D Hartwig chess set does not render correctly

Status: NEW

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

Description

[Gregory Pappas [:gregp]]

Attachment: comparison.png

Steps to reproduce:

1. Navigate to https://codepen.io/juliangarnier/pen/kxGRvV

Actual results:
Broken rendering

Expected results:
Rendering matches Safari and Chromium

I got this regression range with WebRender force-enabled. I'm not 100% confident in it because a lot of builds started crashing towards the end of the bisection and I had to skip a few.
https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=63bc837753d653ab13635e432400c1b6d31d12ca&tochange=fd9b8188501938a9306105a01db5beeefeab1a19

mozregression --arg="https://codepen.io/juliangarnier/full/kxGRvV" --preferences="prefs.json" --good="2019-05-05" --bad="2019-05-25"

prefs.json:

{
  "gfx.webrender.all": true,
  "gfx.webrender.enabled": true,
  // prevent instant content process crash on linux builds earlier than v91
  "security.sandbox.content.level": 0
}

Comment 1

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

Set release status flags based on info from the regressing bug 1532174

Comment 2

[Alice0775 White]

I can also reproduce the issue on Windows11.

Comment 3

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

Set release status flags based on info from the regressing bug 1532174

Comment 4

[Liz Henry (:lizzard) (privacy/fingerprinting team)]

Setting this to fix-optional for Nightly as well since the graphics team has triaged it, and since this is not a recent regression - it's likely been in this state since 2019.