[Webkit-unassigned] [Bug 147215] New: Coordinates-based snap offsets don't update correctly when container is scrolled

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=147215

            Bug ID: 147215
           Summary: Coordinates-based snap offsets don't update correctly
                    when container is scrolled
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: wenson_hsieh at apple.com

If a snap scrolling container with child snap-coordinate elements is scrolled and then snap offsets are recomputed, the snap offset computation will not take the parent scroll offset into account, resulting in incorrectly computed snap offsets. You can reproduce this behavior by following these steps:

  1. Go to whsieh.github.io/examples/grid.html
  2. Scroll somewhere near the lower right corner
  3. Resize the window by any amount
  4. Try scrolling again. Observe that scroll snapping is completely broken

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