Specified
100px green
Not specified, use initial value
200px green
Not specified, but not registered so use initial value for width
500px green
Has a fallback for unregistered property
300px green
Has a fallback for a registered property
PASS Registration is successful
PASS JS Attributes are valid for element 1
PASS JS Attributes are valid for element 2
PASS JS Attributes are valid for element 3
PASS JS Attributes are valid for element 4 and 5