Find node in DOM

<script>
	var steps = [];
	function up(node){
		if(node.previousSibling){
			steps.push('nextSibling');
			node = node.previousSibling;
			up(node);
			return;
		}
		if(node.parentNode){
			steps.push('firstChild');
			node = node.parentNode;
			up(node);
			return;
		}
		down();
	}
	
	function down(){
		var node = document;
		var walk = steps.reverse();
		walk.forEach(function(step){
			node = node[step];
		});
	
		node.style.background = 'red';
		console.log(node);
	}
	
	var start = document.querySelector('#node');
	up(start);
</script>