Interface ValidityStateFlags

interface ValidityStateFlags {
    badInput?: boolean;
    customError?: boolean;
    patternMismatch?: boolean;
    rangeOverflow?: boolean;
    rangeUnderflow?: boolean;
    stepMismatch?: boolean;
    tooLong?: boolean;
    tooShort?: boolean;
    typeMismatch?: boolean;
    valueMissing?: boolean;
}