JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/rxjs/4.1.0/rx.all.min.js"></script>
<div>
    <div>
      clickjack test
    </div>
    <button onclick="deleteAllCookies"> delete cookies </button>
    <iframe src="https://dev.local.domo.com/auth/index" frameborder="0"></iframe>
</div>

CSS

iframe {
  border: 1px solid black;
  width: 900px;
  height: 900px;
}

Babel + JSX

window.deleteAllCookies = function() {
    var cookies = document.cookie.split(";");

    for (var i = 0; i < cookies.length; i++) {
        var cookie = cookies[i];
        var eqPos = cookie.indexOf("=");
        var name = eqPos > -1 ? cookie.substr(0, eqPos) : cookie;
        document.cookie = name + "=;expires=Thu, 01 Jan 1970 00:00:00 GMT";
    }
}