context: this.findNext = function(node, criteria, upOnly, maxRoot){    if (!node)        return null;    if (!upOnly)    {        var next = this.findNextDown(node, criteria);        if (next)            return next;    }        for (var sib = node.nextSibling; sib; sib = sib.nextSibling)    {        if (criteria(sib))            return sib;        var next = this.findNextDown(sib, criteria);        if (next)            return next;    }    if (node.parentNode && node.parentNode != maxRoot)        return this.findNext(node.parentNode, criteria, true);};
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