[Webkit-unassigned] [Bug 145843] New: CSS Scroll Snap - support snapping to nested elements

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=145843

            Bug ID: 145843
           Summary: CSS Scroll Snap - support snapping to nested elements
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: majidvp at chromium.org

According to the current Snap Points Spec draft[1] an scrolling container may snap to snap coordinates that are defined on any of its descendant. Here is the relevant language from the spec:
"The scroll-snap-coordinate property is used to define the x and y coordinate within the element which will align with the *nearest ancestor* scroll container’s snap-destination for the respective axis."

The current Webkit implementation only snaps to snap points defined on immediate children. Lots of interesting layouts outside simple image galleries require in-between layers between scroller and the actual items to provide structure. Firefox implementation of snap points support snapping to arbitrary descendant as opposed to only immediate children.

Here is an simple repro: http://majido.github.io/snap-points/tests/element-snap-coordinates.html
Elements are indented according to their nesting level. Webkit nightly only snaps to black elements (i.e. immediate children) while Firefox snaps to all elements.

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