michael@0: function wrapNode() {
michael@0:   var elm = document.getElementById("test");
michael@0:   var span = document.createElement("span");
michael@0:   span.setAttribute("style", "background: yellow");
michael@0:   var range = document.createRange();
michael@0:   var start = "first second third [".length;
michael@0:   range.setStart(elm.lastChild, start);
michael@0:   range.setEnd(elm.lastChild, start + "fourth".length);
michael@0:   range.surroundContents(span);
michael@0: }
michael@0: 
michael@0: window.addEventListener("load", wrapNode, false);