file_reflect_cookie_into_title.html

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<html>

  <head>

    <meta charset="UTF-8">

    <title>title not set</title>

    <script>

      // if we have a query string, use it to set the cookie and localStorage

      if (window.location.search.length) {

        let context_name = window.location.search.substr(1);

        document.cookie = "userContextId=" + context_name;

        localStorage.setItem("userContext", context_name);

      // get the cookie

      let [name, val] = document.cookie.split("=");

      // set the title to reflect the cookie and local storage values we find

      document.title = "cookie=" + val + "|"

                       + "local=" + localStorage.getItem("userContext");

    </script>

  </head>

  <body></body>

</html>