context: function onTooltip(event){    const XLinkNS = "http://www.w3.org/1999/xlink";    var tipNode = event.originalTarget;    var titleText = null;    var XLinkTitleText = null;        var element = document.tooltipNode;    while (element)    {        if (element.nodeType == Node.ELEMENT_NODE)        {            var text;            if (element.hasAttribute("title"))                text = element.getAttribute("title");            else if (element.hasAttributeNS(XLinkNS, "title"))                text = element.getAttributeNS(XLinkNS, "title");            if (text)            {                tipNode.setAttribute("label", text);                return true;            }        }        element = element.parentNode;    }    return false;}
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