ElementInternals: validationMessage property

Baseline 2023

Newly available

Since March 2023, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.

The validationMessage read-only property of the ElementInternals interface returns the validation message for the element.

A string containing the validation message of this element.

In the following example the validation message is set with ElementInternals.setValidity(), and then returned with validationMessage.

this.internals_.setValidity({ valueMissing: true }, "my message");
console.log(this.internals_.validationMessage); // "my message"

Specification
HTML Standard # dom-elementinternals-validationmessage

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