[Webkit-unassigned] [Bug 263955] New: Eight css WPTs are failing with async overflow scrolling enabled on macOS

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=263955

            Bug ID: 263955
           Summary: Eight css WPTs are failing with async overflow
                    scrolling enabled on macOS
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: a_protyasha at apple.com
                CC: a_protyasha at apple.com,
                    webkit-bug-importer at group.apple.com

Eight WPTs from the `css/` directory are failing in ToT with the `AsyncOverflowScrollingEnabled` web preference set to true. A couple of the failures are not concerning, but at any rate, here is a summary.

The failed tests:
imported/w3c/web-platform-tests/css/compositing/mix-blend-mode/mix-blend-mode-parent-element-overflow-scroll.html
imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-lr-001.html
imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-rl-001.html
imported/w3c/web-platform-tests/css/css-masking/clip/clip-rect-scroll.html
imported/w3c/web-platform-tests/css/css-overflow/overflow-auto-scrollbar-gutter-intrinsic-003.html
imported/w3c/web-platform-tests/css/css-position/position-fixed-scroll-nested-fixed.html
imported/w3c/web-platform-tests/css/css-scrollbars/textarea-scrollbar-width-none.html
imported/w3c/web-platform-tests/css/css-ui/outline-negative-offset-composited-scroll.html

Of these eight tests, `imported/w3c/web-platform-tests/css/css-overflow/overflow-auto-scrollbar-gutter-intrinsic-003.html` and `imported/w3c/web-platform-tests/css/css-scrollbars/textarea-scrollbar-width-none.html` only have a 0.01% image diff, and shouldn't really be failing.

While the other tests have regressed, they now show the same failure mode as what WebDriver produces (i.e. WKTR test results and wpt.fyi test results match).

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