[Webkit-unassigned] [Bug 240064] New: Sudden major rendering bug in the whole browser.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=240064

            Bug ID: 240064
           Summary: Sudden major rendering bug in the whole browser.
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Mac (Intel)
                OS: macOS 10.15
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: victorhugocgodoi at gmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 458793

  --> https://bugs.webkit.org/attachment.cgi?id=458793&action=review

Video of the bug while it's happening.

Not sure if I provided the correct version. User Agent provided by the console: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.54 Safari/537.36

I'm only reporting this bug here because although this bug happened recently in Brave Browser, it also happened another couple times, a while ago, in Google Chrome, and all of them on this Mac.

Occasionally, while using the Browser on a regular basis, its rendering just gets messed up. Suddenly, all text from all sites disappear, many elements lose their styles, images stop working, some elements get a green background. Even the browser's interface falls victim (tabs, bookmarks, inspector etc.). However, videos continue playing.

I could not find how to replicate this bug, i didn't identify what triggers it, and it happens very rarely, but today, it decided to happen twice in less than a hour. It probably happened around 6 times in this Mac in a timespan of 4~5 years. 

In some occasions, the bug happens all of a sudden, and all at once. But sometimes, it happens as you interact with the browser (e.g.: the tabs are fine until I hover it with the cursor; an image is fine until you hover on it).

Restarting the Browser fixes the problem. 

I've included a video capture of the bug.

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