localStorage

https://stackoverflow.com/questions/45062308/set-cookie-after-closing-div#

by Florian Sommerfeld

HTML

<span class="boxclose" id='close'>X</span>
  <script type="text/javascript">
    window.onload = function() {
      if (typeof(Storage) !== "undefined") {
        if (localStorage.getItem("closed") == "True") {    document.getElementById('close').parentNode.parentNode.parentNode.removeChild(document.getElementById('close').parentNode.parentNode);
        }
        document.getElementById('close').onclick = function() {
          this.parentNode.parentNode.parentNode.removeChild(this.parentNode.parentNode);
          localStorage.setItem("closed", "True");
          return false;
        };
      } else {
        alert("Your browser does not support localStorage");
      }
    };
  </script>