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