ssl-warning.html

<script>
  // simple jQuery version. change variables to customize.
  window.parseTLSinfo = function(data) {
    var alert_classes = 'ssl-notice alert';
    var prepend_to = 'body';
    
    var tls_version = parseFloat(data.tls_version.split(/\s+/)[1]);
    if (isNaN(tls_version)) { throw "couldn't parse TLS version from input: " + data.tls_version; }
    
    if (tls_version < 1.1) {
      var notice = jQuery("<div class='" + alert_classes + "'>" +
        "<p>Your browser will be unable to access this site after June 30, 2016" +
        " because it does not support modern encryption technology. Before that" +
        " happens, please <a href='https://whatbrowser.org' target='_blank'>upgrade</a> as soon as possible.</p>" +
        "<p>If you are running Windows XP or Vista, please install" +
        " <a href='https://www.google.com/chrome/browser/desktop/' target='_blank'>Google Chrome</a>" +
        " or <a href='https://www.mozilla.org/en-US/firefox/new/' target='_blank'>Mozilla Firefox</a>," +
        " as Microsoft is not updating Internet Explorer on these operating systems.</p>" +
        "</div>"
      );
      jQuery(prepend_to).prepend(notice);
    }
  };
</script>
<script src="https://www.howsmyssl.com/a/check?callback=parseTLSinfo"></script>