Available on HTML5
ValidityState interface represents the validity states that an element can be in, with respect to constraint validation. Together, they help explain why an element's value fails to validate, if it's not valid.
Boolean indicating the user has provided input that the browser is unable to convert.
Boolean indicating the element's custom validity message has been set to a non-empty string by calling the element's
Boolean indicating the value does not match the specified
Boolean indicating the value is greater than the maximum specified by the
Boolean indicating the value is less than the minimum specified by the
Boolean indicating the value does not fit the rules determined by the
step attribute (that is, it's not evenly divisible by the step value).
Boolean indicating the value exceeds the specified
HTMLTextAreaElement objects. Note: This will never be
true in Gecko, because elements' values are prevented from being longer than
Boolean indicating the value is not in the required syntax (when
Boolean indicating the element meets all constraint validations, and is therefore considered to be valid.