Test that setting and getting justify-items works as expected


PASS Test getting justify-items set through CSS.
PASS Test initial value of justify-items through JS
PASS Test getting and setting justify-items through JS
PASS Test 'legacy' value resolution for the root node
PASS Test bad combinations of justify-items
PASS Test the value 'initial'
PASS Test the value 'initial' for grid containers
PASS Test the value 'initial' for flex containers
PASS Test the value 'inherit'
PASS Test the legacy alignment