To reproduce: 1. run-webkit-tests -2 svg/W3C-SVG-1.1 All of the tests fail. They're rendering at 800x600 instead of at 480x360.
WebKitTestRunner does resize the WKView to the right size before loading the test page. However, this size does not take effect right away because ChunkedUpdateDrawingAreaProxy::setSize bails out because m_isWaitingForDidSetFrameNotification is true. It was set to true when the window was first created and sized.
<rdar://problem/8696884>
Looks like this has been fixed, likely due to the new drawing area.
*** This bug has been marked as a duplicate of bug 46862 ***