Baseline Widely available
The validationMessage read-only property of the HTMLOutputElement interface returns a string representing a localized message that describes the validation constraints that the <output> control does not satisfy (if any). This is the empty string as <output> elements are not candidates for constraint validation (HTMLOutputElement.willValidate is false).
The empty string, "";
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HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4