DOMParser vs createElement-innerHTML

// Preparation code goes here
function preparationCode() {

    // code here
    // use global variable syntax because the other perf testing funcs need access
    txt = "<html><head></head><body><div id='hi' class='box'>hello world</div><p>hey</p></body></html>";
    regex = /^[\s\S]*<\s*body[^>]*>([\s\S]*)<\/body>[\s\S]*$/;

}


// DEFINE FUNCTION 1 HERE
function function1() {

    var p = new DOMParser(), div;
    div = p.parseFromString(txt, "text/html");

    div.getElementById("hi").className;

}

// DEFINE FUNCTION 2 HERE
function function2() {

    var text = txt.replace(regex, "$1"),
    div = document.createElement("body"); div.innerHTML = text;

    document.evaluate(".//div[@id='hi']", div, null, 9, null).singleNodeValue.className;

}