Method normalize is missing on Node

[henningko]

The method normalize seems to be missing from Node. It "merges" child text nodes, so that no text nodes are adjacent to another:
https://developer.mozilla.org/en-US/docs/Web/API/Node/normalize

This example unwraps the node el, which can be any existing element with a parent node

import {
  DOMParser,
  Node,
  Document,
} from "https://deno.land/x/deno_dom/deno-dom-wasm.ts";

const parent = el.parentNode;
while (el.firstChild) parent.insertBefore(el.firstChild, el);
parent.removeChild(el);
parent.normalize();
// Error: Property 'normalize' does not exist on type 'Node'.