<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
// Dispatch of these events is tested elsewhere.
// This test merely ensures that the event handler content attributes work.
let eventNames = ["load", "message", "messageerror"];
test(() => {
  try {
    assert_implements("HTMLPortalElement" in self);
    let portal = document.createElement("portal");
    for (let eventName of eventNames) {
      window.testValue = "not fired";
      portal.setAttribute("on" + eventName, "window.testValue = 'fired'");
      portal.dispatchEvent(new Event(eventName));
      assert_equals(window.testValue, "fired", `${eventName} should have fired`);

      window.testValue = "not fired";
      portal.removeAttribute("on" + eventName);
      portal.dispatchEvent(new Event(eventName));
      assert_equals(window.testValue, "not fired", `${eventName} should not have fired`);
    }
  } finally {
    delete window.testValue;
  }
}, "Tests that event handler content attributes for supported event names work.");
</script>
