The following ObjectPaintInvalidatorTest tests are failing with LayoutNG:

ObjectPaintInvalidatorTest.TraverseStackedFloatUnderCompositedInline
ObjectPaintInvalidatorTest.TraverseFloatUnderMultiLevelCompositedInlines
ObjectPaintInvalidatorTest.TraverseFloatUnderCompositedInline

Like this:

Expected: has 3 elements where
element #0 is equal to "LayoutInline (relative positioned) SPAN id='span'" reason=subtree,
element #1 is equal to "LayoutText #text" reason=subtree,
element #2 is equal to "LayoutNGBlockFlow (relative positioned) (floating) DIV id='target'" reason=subtree
  Actual: { "NGPhysicalBoxFragment LayoutInline (relative positioned) SPAN id='span'" reason=subtree, "LayoutNGBlockFlow (relative positioned) (floating) DIV id='target'" reason=subtree }, which has 2 elements

Looks like we need to write NG-specific expectations here?