ENUM
public enum ConformanceLevel: Int
An enum specifying all WCAG conformance levels.
case A = 1
The minimum level of conformance.
case AA = 2
The medium level of conformance including success criterias of level A.
case AAA = 3
The highest level of conformance including success criterias of level A and AA.
case failed = 0
Indicates that no level of conformance has been reached.