[Webkit-unassigned] [Bug 153480] New: CSS Scroll Snap not enforced when you move the cursor between scrollable elements

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=153480

            Bug ID: 153480
           Summary: CSS Scroll Snap not enforced when you move the cursor
                    between scrollable elements
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Macintosh
                OS: Mac OS X 10.11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: m.goleb+bugzilla at gmail.com

Please see http://output.jsbin.com/sukerik/2/. The page contains multiple horizontally scrollable divs with CSS scroll snapping enabled. Use a trackpad or the Magic Mouse to scroll right on the first element and then, before the scroll finishes, quickly move the cursor down, passing a few more pictures. The effect is that some containers stop between the pictures even though CSS scroll snap should not allow them to stop at such points.

It seems to me that once the cursor moves to another scrollable area, the engine immediately stops scrolling in the previous one without taking into account the needs of CSS scroll snap.

I tested it on WebKit Nightly r195574, the latest one. Safari 9.0.3 shares this problem as well. This shouldn't be a problem on mobile when you can't "move the cursor".

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