Test that setting and getting justify-self works as expected


PASS Test getting justify-self set through CSS. 
PASS Test initial value of justify-self through JS 
PASS Test getting and setting justify-self through JS 
PASS Test 'auto' value resolution for the root node 
PASS Test bad combinations of justify-self 
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 'initial' for positioned elements 
PASS Test the value 'initial' for positioned elements in grid containers 
PASS Test the value 'initial' for positioned elements in grid containers 2 
PASS Test the value 'inherit'