HTMLButtonElement: validationMessage 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 validationMessage read-only property of the HTMLButtonElement interface returns a string representing a localized message that describes the validation constraints that the control does not satisfy (if any). This is the empty string if the control is not a candidate for constraint validation (the 's type is button or reset), or it satisfies its constraints.
If the is a candidate for constraint validation (the type is set or defaults to submit and HTMLButtonElement.willValidate is true) and the constraints are not met (there is a non-null ValidityState.customError), the value is the error message that would be shown to the user during element validation.
Value
A string.
Specifications
| Specification |
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| HTML # dom-cva-validationmessage-dev |