context: this.getElementsByXPath = function(doc, xpath){    var nodes = [];    try {        var result = doc.evaluate(xpath, doc, null, XPathResult.ANY_TYPE, null);        for (var item = result.iterateNext(); item; item = result.iterateNext())            nodes.push(item);    }    catch (exc)    {        // Invalid xpath expressions make their way here sometimes.  If that happens,        // we still want to return an empty set without an exception.    }        return nodes;};
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