http://build.webkit.org/results/Apple%20MountainLion%20Debug%20WK1%20(Tests)/r128900%20(969)/results.html Perhaps the tests depend on what runs before them? --- /Volumes/Data/slave/mountainlion-debug-tests-wk1/build/layout-test-results/compositing/rtl/rtl-fixed-expected.txt +++ /Volumes/Data/slave/mountainlion-debug-tests-wk1/build/layout-test-results/compositing/rtl/rtl-fixed-actual.txt @@ -3,7 +3,12 @@ (children 1 (GraphicsLayer (bounds 800.00 600.00) - (children 1 + (children 2 + (GraphicsLayer + (position 50.00 50.00) + (bounds 100.00 100.00) + (drawsContent 1) + ) (GraphicsLayer (position 50.00 50.00) (bounds 100.00 100.00) --- /Volumes/Data/slave/mountainlion-debug-tests-wk1/build/layout-test-results/compositing/rtl/rtl-fixed-overflow-expected.txt +++ /Volumes/Data/slave/mountainlion-debug-tests-wk1/build/layout-test-results/compositing/rtl/rtl-fixed-overflow-actual.txt @@ -4,7 +4,12 @@ (children 1 (GraphicsLayer (bounds 1000.00 1000.00) - (children 1 + (children 2 + (GraphicsLayer + (position 265.00 50.00) + (bounds 100.00 100.00) + (drawsContent 1) + ) (GraphicsLayer (position 265.00 50.00) (bounds 100.00 100.00) compositing/iframes/overlapped-nested-iframes.html has a similar kind of trouble, but a different change history, so I'm not sure if it should be tracked together with these.