// https://html.spec.whatwg.org/multipage/form-elements.html#htmloutputelement
[Exposed=Window]
interface HTMLOutputElement : HTMLElement {
    [HTMLConstructor] constructor();

    [SameObject, PutForwards=value] readonly attribute DOMTokenList htmlFor;
    readonly attribute HTMLFormElement? form;
    [CEReactions, Reflect] attribute DOMString name;

    readonly attribute DOMString type;
    [CEReactions] attribute Utf16DOMString defaultValue;
    [CEReactions] attribute Utf16DOMString value;

    readonly attribute boolean willValidate;
    readonly attribute ValidityState validity;
    readonly attribute Utf16DOMString validationMessage;
    boolean checkValidity();
    boolean reportValidity();
    undefined setCustomValidity(DOMString error);

    readonly attribute NodeList labels;
};
