[Webkit-unassigned] [Bug 149895] New: Kinetic scrolling breaks on Mac when using 100% height, box-sizing: border-box with top and bottom borders

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=149895

            Bug ID: 149895
           Summary: Kinetic scrolling breaks on Mac when using 100%
                    height, box-sizing: border-box with top and bottom
                    borders
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Macintosh
                OS: Mac OS X 10.11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jonowells at webkit.org
                CC: andersca at apple.com, simon.fraser at apple.com,
                    thorton at apple.com

Created attachment 262637
  --> https://bugs.webkit.org/attachment.cgi?id=262637&action=review
Scrolling: Reduced test case.

In Mac OS X (possibly also iOS) scrolling an item with 100% height, box-sizing set to border-box and pixel values for top and bottom borders, the kinetic scrolling will not reach the bottom if the trackpad is, say, flicked hard with two fingers from the top and left to scroll under its own momentum. The scrolling will stop shy of the bottom by the same as the border height. To reach the bottom the fingers need to still be touching the trackpad. It seems like a more linear scrolling animation kicks in by mistake. Reduced test case attached.

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