ValidityState

The read-only badInput property of the ValidityState interface indicates if the user has provided input that the browser is unable to convert.

The read-only customError property of the ValidityState interface returns true if an element doesn't meet the validation required in the custom validity set by the element's HTMLInputElement.setCustomValidity method.

The read-only patternMismatch property of the ValidityState interface indicates if the value of an input, after having been edited by the user, does not conform to the constraints set by the element's pattern attribute.

The read-only rangeOverflow property of the ValidityState interface indicates if the value of an input, after having been edited by the user, does not conform to the constraints set by the element's max attribute.

The read-only rangeUnderflow property of the ValidityState interface indicates if the value of an input, after having been edited by the user, does not conform to the constraints set by the element's min attribute.

The read-only stepMismatch property of the ValidityState interface indicates if the value of an input, after having been edited by the user, does not conform to the constraints set by the element's step attribute.

The read-only tooLong property of the ValidityState interface indicates if the value of an input or textarea, after having been edited by the user, exceeds the maximum code-unit length established by the element's maxlength attribute.

The read-only tooShort property of the ValidityState interface indicates if the value of an input, button, select, output, fieldset or textarea, after having been edited by the user, is less than the minimum code-unit length established by the element's minlength attribute.

The read-only typeMismatch property of the ValidityState interface indicates if the value of an input, after having been edited by the user, does not conform to the constraints set by the element's type attribute.

The read-only valid property of the ValidityState interface indicates if the value of an input element meets all its validation constraints, and is therefore considered to be valid.

The read-only valueMissing property of the ValidityState interface indicates if a required control, such as an input, select, or textarea, has an empty value.