[Webkit-unassigned] [Bug 223175] New: [css-scroll-snap] Properly handle overflowing snap areas

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=223175

            Bug ID: 223175
           Summary: [css-scroll-snap] Properly handle overflowing snap
                    areas
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mrobinson at webkit.org

When a snap area overflows the snapper, the specification details some specific handling. From https://www.w3.org/TR/css-scroll-snap-1/#snap-overflow:

  If the snap area is larger than the snapport in a particular axis, then any scroll position
  in which the snap area covers the snapport, and the distance between the geometrically
  previous and subsequent snap positions in that axis is larger than size of the snapport in
  that axis, is a valid snap position in that axis. The UA may use the specified alignment as a
  more precise target for certain scroll operations (e.g. explicit paging).

This implies that we keep snap area dimension around when we didn't before.

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