[Webkit-unassigned] [Bug 204120] New: Rendering artifacts when scrolling overlays

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=204120

            Bug ID: 204120
           Summary: Rendering artifacts when scrolling overlays
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jason at cloudfour.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

We've noticed a rendering issue on Decathlon.com on this page in an overlay:
https://www.decathlon.com/products/soccer-ball-hybrid-size-5-f100?adept-product=soccer-ball-hybrid-size-5-f100&variant=35881848717&adept_product_id=soccer-ball-hybrid-size-5-f100&source=search

When scrolling in overlays, white bars obscure portions of the UI. I've recorded two videos.

This documents the behavior:
https://www.youtube.com/watch?v=OhlIsJCeWAE

This video documents a compositing issue that is caused by a script that Shopify is adding to the page. I'm not sure if it is related or not, but I wanted to highlight it so you know that this is happening as well (and that I'm trying to get Shopify to fix it).
https://youtu.be/l9nurb5mvVU

I tested on an iOS 12 device and could not replicate the artifacts so I _think_ this was introduced with iOS 13.

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