 
RUN(internals.setFullscreenInsetTop(1))
EXPECTED (window.getComputedStyle(target).top == '1px') OK
RUN(internals.setFullscreenInsetTop(20))
EXPECTED (window.getComputedStyle(target).top == '20px') OK
RUN(internals.setFullscreenInsetTop(0))
EXPECTED (window.getComputedStyle(target).top == '0px') OK
END OF TEST