Baseline Widely available
The checkValidity() method of the HTMLButtonElement interface returns a boolean value which indicates if the element meets any constraint validation rules applied to it. If false, the method also fires an invalid event on the element. Because there's no default browser behavior for checkValidity(), canceling this invalid event has no effect. It always returns true if the <button> element's type is "button" or "reset", because such buttons are never candidates for constraint validation.
Note: An HTML <button> element of the "submit" type with a non-null validationMessage is considered invalid, will match the CSS :invalid pseudo-class, and will cause checkValidity() to return false. Use the HTMLButtonElement.setCustomValidity() method to set the HTMLButtonElement.validationMessage to the empty string to set the validity state to be valid.
None.
Return valueReturns true if the element's value has no validity problems; otherwise, returns false.
In the following example, calling checkValidity() returns either true or false.
const element = document.getElementById("myButton");
console.log(element.checkValidity());
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