[Webkit-unassigned] [Bug 114722] New: [CSS Regions] clip rectangles are incorrectly computed in some positioned elements

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=114722

           Summary: [CSS Regions] clip rectangles are incorrectly computed
                    in some positioned elements
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mibalan at adobe.com
                CC: WebkitBugTracker at adobe.com
            Blocks: 57312


Created an attachment (id=198476)
 --> (https://bugs.webkit.org/attachment.cgi?id=198476&action=review)
Test-case

Positioned content generated by MathJax gets clipped or rendered invisibly, depending on the position of the region against the viewport.

Reproduction
------------
- open attachment
- click on the button

Actual
------
For each click, the region moves down and some of the equation gets clipped (not all of it)

Expected
--------
For each click, the region moves down but the equation keeps showing

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