Test that a fixed positioned element in a named flow that overlaps a composited element is composited too.

On success you should see a green rectangle over an orange rectangle.

(GraphicsLayer
  (anchor 0.00 0.00)
  (bounds 800.00 600.00)
  (children 1
    (GraphicsLayer
      (bounds 800.00 600.00)
      (contentsOpaque 1)
      (children 2
        (GraphicsLayer
          (position 150.00 150.00)
          (bounds 100.00 100.00)
          (contentsOpaque 1)
        )
        (GraphicsLayer
          (position 200.00 200.00)
          (bounds 100.00 100.00)
          (contentsOpaque 1)
        )
      )
    )
  )
)