Method previousSibling

src/undom.js:42–45

()

			if (p) return p.childNodes[findWhere(p.childNodes, this, true) + 1];
		}
		get previousSibling() {
			let p = this.parentNode;
			if (p) return p.childNodes[findWhere(p.childNodes, this, true) - 1];
		}
		get firstChild() {
			return this.childNodes[0];
		}