script
const x = document.getElementById(result);
 Check browser support for SSE
if(typeof(EventSource) !== undefined) {
  var source = new EventSource(demo_sse.php);
  source.onmessage = function(event) {
    x.innerHTML += event.data + br;
  };
} else {
  x.innerHTML = Sorry, no support for server-sent events.;
}
script