HTMLFieldSetElement: validationMessage property

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

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The validationMessage read-only property of the HTMLFieldSetElement interface returns a string representing a localized message that describes the validation constraints that the <fieldset> control does not satisfy (if any). This is the empty string as <fieldset> elements are not candidates for constraint validation (HTMLFieldSetElement.willValidate is false).