TextNode near Input finder

gistfile1.js

(function(){
	function nativeTreeWalker() {
	    var walker = document.createTreeWalker(
	        document.body, 
	        NodeFilter.SHOW_TEXT, 
	        null, 
	        false
	    ),node,textNodes = [];
	    while (node = walker.nextNode()) {
	    	if (node.nodeValue) {
	        	textNodes.push(node);
	    	}
	    }
	    return textNodes;
	}

	function collide(b1,b2){
		return !(b1.x+b1.w < b2.x)
			&&
				!(b1.x > b2.x+b2.w)
			&&
				!(b1.y+b1.h < b2.y)
			&&
				!(b1.y > b2.y+b2.h);
	}

	function coords(element) {
	  var x = 0,y = 0,obj = {
	  	w:element.offsetWidth,h:element.offsetHeight
	  };
	  while (element.offsetParent) {
	    x += element.offsetLeft;
	    y += element.offsetTop;
	    element = element.offsetParent;
	  }
	  return {x:x,y:y,w:obj.w,h:obj.h};
	}

	var textNodes = nativeTreeWalker(),nodes  = document.querySelectorAll("input[type=text]"),nodec;
	for (var i = nodes.length - 1; i >= 0; i--) {
		nodec = coords(nodes[i]);
		nodec.x-=100;
		nodec.y-=100;
		nodec.w+=200;
		nodec.h+=200;

		console.log(nodes[i]);
		for (var j = textNodes.length - 1; j >= 0; j--) {
			if (textNodes[j].nodeValue.trim().length > 0 && collide(nodec,coords(textNodes[j].parentNode))) {
				console.log(textNodes[j].nodeValue);
				//uncomment this line to get a graphical result
				//textNodes[j].parentNode.style.border = "solid red 2px";
			}
		};
	};
})();