eYOffset || document.documentElement.scrollTop;
        var url = event.target.getAttribute("href");
        if (url.indexOf("http") === -1 || url.indexOf(window.location.host) !== -1) {
        let contentURL = url.split('#')[0]
        if (!linkHistories[contentURL]) {
        iframe.src = contentURL
        iframe.onload = function () {
          tooltipContentHtml = ''
          tooltipContentHtml += '<div style="font-weight: bold; unicode-bidi: plaintext;">' + iframe.contentWindow.document.querySelecto