
PASS var() references work with registered properties 
FAIL References to registered var()-properties work in registered lists assert_equals: expected "1px, 10px, 2px" but got "0px"
FAIL References to mixed registered and unregistered var()-properties work in registered lists assert_equals: expected "1px, 20px, 10px, 2px" but got "0px"
FAIL Registered lists may be concatenated assert_equals: expected "1px, 10px, 2px, 1px, 20px, 10px, 2px" but got "0px"
PASS Font-relative units are absolutized when substituting 
PASS Calc expressions are resolved when substituting 
FAIL Lists with relative units are absolutized when substituting assert_equals: expected "110px, 120px" but got "0px"
PASS Valid fallback does not invalidate var()-reference [<length>, 10px] 
PASS Valid fallback does not invalidate var()-reference [<length> | <color>, red] 
PASS Valid fallback does not invalidate var()-reference [<length> | none, none] 
FAIL Invalid fallback invalidates var()-reference [<length>, red] assert_equals: expected "" but got "40px"
FAIL Invalid fallback invalidates var()-reference [<length> | none, nolength] assert_equals: expected "" but got "40px"
FAIL Invalid fallback invalidates var()-reference [<length>, var(--novar)] assert_equals: expected "" but got "40px"