[Webkit-unassigned] [Bug 191029] New: [iOS 12] CSS Scroll Snap visual glitches on iOS when programmatically setting `style` on children

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=191029

            Bug ID: 191029
           Summary: [iOS 12] CSS Scroll Snap visual glitches on iOS when
                    programmatically setting `style` on children
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: iPhone / iPad
                OS: iOS 12
            Status: NEW
          Severity: Major
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: t at hom.as

Deriving from https://stackoverflow.com/questions/52989070/css-scroll-snap-visual-glitches-on-ios-when-programmatically-setting-style-on:

https://codepen.io/thomaslindstr_m/pen/qJLbwa
Pretty bare bones example above. I want to fade out the child I scrolled away from, but when CSS Scroll Snap is enabled, it starts glitching really bad on my iPhone iOS 12.0.1.

See video here: https://file-qacepzxlkb.now.sh
Before the reload I disabled Scroll Snap (JavaScript still running), after the reload, I enable it.

It runs perfectly fine in Safari 12.

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