JSFiddle - React, Tailwind, and code Playground

HTML

<a href="http://www.google.com" onclick="return OpenOrFocus(this, 'help');">Open</a>

JavaScript

var _arrAllWindows = new Array();
function OpenOrFocus(oLink, sTarget) {
    var oWindow = _arrAllWindows[sTarget];
    if (!oWindow || oWindow.closed) {
        oWindow = window.open(oLink.href, sTarget);
        _arrAllWindows[sTarget] = oWindow;
    }
    oWindow.focus();
    return false;
}