Function childrenOf

lib/html/syntax.js:4700–4703

(parent)

	 * @returns {HtmlNode[]} children array to insert into
	 */
	const childrenOf = (parent) =>
		parent.type === NodeType.Element && parent.templateContent
			? parent.templateContent.children
			: parent.children;

	const appendTo = (
		/** @type {HtmlElement | HtmlDocument | HtmlDocumentFragment} */ parent,