HTMLOutputElement: 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 August 2016.
The validity read-only property of the HTMLOutputElement interface returns a ValidityState object that represents the validity states this element is in. Although <output> elements are never candidates for constraint validation, the validity state may still be invalid if a custom validity message has been set.
Value
A ValidityState object.
Examples
The following example demonstrates that an <output> is in an invalid state when a customError is set; in this state, checkValidity() returns true while the validityState's validity property is false.
js
const output = document.getElementById("myOutput"); output.setCustomValidity("This object element is invalid."); const validityState = output.validity; console.log(validityState.valid); // false console.log(validityState.customError); // true console.log(output.checkValidity()); // true Specifications
| Specification |
|---|
| HTML # the-constraint-validation-api:dom-cva-validity |