Can someone help me understand what this Firebug method is doing?

this.appendInnerHTML = function(element, html, referenceElement)
{
    var doc = element.ownerDocument;
    var range = doc.createRange();
    range.selectNode(doc.body);

    var fragment = range.createContextualFragment(html);
    element.insertBefore(fragment, referenceElement);
};

jjb
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