File: localStorageEvents.html

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<script>

let eventCounter = 0;

onmessage = e => {
  if (e.data == "getValue") {
    parent.postMessage(localStorage.foo, "*");
    return;
  }

  if (e.data == "setValue") {
    localStorage.foo = "tracker-" + Math.random();
    return;
  }

  if (e.data == "getEvents") {
    parent.postMessage(eventCounter, "*");
    return;
  }

  if (e.data == "reload") {
    window.location.reload();
  }
};

addEventListener("storage", _ => {
  ++eventCounter;
});

</script>