Function detach

lib/html/syntax.js:5540–5546

(/** @type {HtmlNode} */ node)

	};

	const detach = (/** @type {HtmlNode} */ node) => {
		const p = findParent(node);
		if (!p) return;
		const arr = childrenOf(p);
		const idx = arr.indexOf(node);
		if (idx !== -1) arr.splice(idx, 1);
	};

	// ---------- insertion modes ----------