LayoutTests/webanimations/opacity-animation-yields-compositing-expected.txt

(GraphicsLayer
  (anchor 0.00 0.00)
  (bounds 800.00 600.00)
  (children 1
    (GraphicsLayer
      (bounds 800.00 600.00)
      (contentsOpaque 1)
      (children 1
        (GraphicsLayer
          (position 8.00 8.00)
          (bounds 100.00 100.00)
          (opacity 0.50)
          (contentsOpaque 1)
        )
      )
    )
  )
)