HTMLFieldSetElement: validity property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨July 2015⁩.

The validity read-only property of the HTMLFieldSetElement interface returns a ValidityState object that represents the validity states this element is in. Although <fieldset> elements are never candidates for constraint validation, the validity state may still be invalid if a custom validity message has been set.

Note: The :valid and :invalid CSS pseudo-classes are applied to <fieldset> elements based on the validity of its descendant form controls, not the fieldset itself.

Value

A ValidityState object.

Examples

The following example demonstrates that a <fieldset> is in an invalid state when a customError is set; in this state, checkValidity() returns true while the validityState's validity property is false.

const fieldSet = document.getElementById("myFieldSet");
fieldSet.setCustomValidity("This fieldset is invalid.");
const validityState = fieldSet.validity;
console.log(validityState.valid); // false
console.log(validityState.customError); // true
console.log(fieldSet.checkValidity()); // true

Note: The :valid and :invalid CSS pseudo-classes are applied to <fieldset> elements based on the validity of its descendant form controls, not the fieldset itself.