<!DOCTYPE html>
<html>
  <body onload="init()">
    <p><span id="res"></span></p>
    <script>
      function init() {
        setInterval(() => {
          loadDoc("racestate.txt");
        }, 250);
      }
      function loadDoc(url) {
        var xhttp = new XMLHttpRequest();
        xhttp.onreadystatechange = function() {
          if (this.readyState == 4 && this.status == 200) {
            document.getElementById("res").innerHTML = this.responseText;
          }
        };
        xhttp.open("GET", url, true);
        xhttp.send();
      }
    </script>
  </body>
</html>