Definition
HTML Standard defines HTMLFieldSetElement
[Exposed=Window]
interface HTMLFieldSetElement : HTMLElement {
[HTMLConstructor] constructor();
[CEReactions] attribute boolean disabled;
readonly attribute HTMLFormElement? form;
[CEReactions] attribute DOMString name;
readonly attribute DOMString type;
[SameObject] readonly attribute HTMLCollection elements;
readonly attribute boolean willValidate;
[SameObject] readonly attribute ValidityState validity;
readonly attribute DOMString validationMessage;
boolean checkValidity();
boolean reportValidity();
undefined setCustomValidity(DOMString error);
};