
PASS Registered properties are correctly inherited (or not) depending on the inherits flag. 
PASS Explicitly inheriting from a parent with an invalid value results in initial value. 
PASS Explicitly inheriting from a parent with no value results in initial value. 
PASS Reference to undefined variable results in inherited value 
PASS Reference to syntax-incompatible variable results in inherited value 
PASS Font-relative units are absolutized before before inheritance 
PASS Calc expressions are resolved before inheritance