gecko-dev/dom/abort/tests/file_abort_controller.html

<script>
function ok(a, msg) {
  parent.postMessage({ type: "check", status: !!a, message: msg }, "*");
}

function is(a, b, msg) {
  ok(a === b, msg);
}

function testWebIDL() {
  ok("AbortController" in self, "We have a AbortController prototype");
  ok("AbortSignal" in self, "We have a AbortSignal prototype");

  var ac = new AbortController();
  ok(!!ac, "AbortController can be created");
  ok(ac instanceof AbortController, "AbortController is a AbortController");

  ok(!!ac.signal, "AbortController has a signal");
  ok(ac.signal instanceof AbortSignal, "abortSignal is a AbortSignal");
  is(ac.signal.aborted, false, "By default AbortSignal.aborted is false");
  next();
}

function testUpdateData() {
  var ac = new AbortController();

  is(ac.signal.aborted, false, "By default AbortSignal.aborted is false");

  ac.abort();
  is(ac.signal.aborted, true, "Signal is aborted");

  next();
}

function testAbortEvent() {
  var ac = new AbortController();
  ac.signal.onabort = function(e) {
    is(e.type, "abort", "Abort received");
    next();
  }
  ac.abort();
}

var steps = [
  // Simple stuff
  testWebIDL,
  testUpdateData,

  // Event propagation
  testAbortEvent,
];

function next() {
  if (!steps.length) {
    parent.postMessage({ type: "finish" }, "*");
    return;
  }

  var step = steps.shift();
  step();
}

next();

</script>