Just some javascript which wraps a span-element around all text nodes within a given node. This is not useful in itself, but is a skeleton for future javascript which want to convert text on a page some way or another. Only tested in chrome for now.

gistfile1.js

 <script type="text/javascript">
 	"use strict";
 	function changeAll() {
 		wrapSpan(
 			document.getElementsByTagName('body')[0], 0
 		);
 	}

 	/**
 	 * Wrap a span element around all text nodes.
 	 **/
 	function wrapSpan(node, index) {
 		if(node.nodeName === '#text') {
 			var text = node.textContent;
 			var s = document.createElement('span');

 			s.textContent = text;
 			node.parentElement.insertBefore(s, node.parentElement.childNodes[index]);
 			node.remove();
 			
 		} else {
 			var length = node.childNodes.length;
 			// childNodes is a collection, not an array. :-/
 			for(var i = 0; i < length; i++)
 				wrapSpan(node.childNodes[i], i);
 		}
 	}
 </script>