Definition
HTML Standard defines HTMLOutputElement
[Exposed=Window]
interface HTMLOutputElement : HTMLElement {
[HTMLConstructor] constructor();
[SameObject, PutForwards=value] readonly attribute DOMTokenList htmlFor;
readonly attribute HTMLFormElement? form;
[CEReactions] attribute DOMString name;
readonly attribute DOMString type;
[CEReactions] attribute DOMString defaultValue;
[CEReactions] attribute DOMString value;
readonly attribute boolean willValidate;
readonly attribute ValidityState validity;
readonly attribute DOMString validationMessage;
boolean checkValidity();
boolean reportValidity();
undefined setCustomValidity(DOMString error);
readonly attribute NodeList labels;
};