Definition
DOM Standard defines ParentNode
interface mixin ParentNode {
[SameObject] readonly attribute HTMLCollection children;
readonly attribute Element? firstElementChild;
readonly attribute Element? lastElementChild;
readonly attribute unsigned long childElementCount;
[CEReactions, Unscopable] undefined prepend((Node or DOMString)... nodes);
[CEReactions, Unscopable] undefined append((Node or DOMString)... nodes);
[CEReactions, Unscopable] undefined replaceChildren((Node or DOMString)... nodes);
Element? querySelector(DOMString selectors);
[NewObject] NodeList querySelectorAll(DOMString selectors);
};