<!doctype html>
<meta charset=utf-8>
<title>activeElement when focusing different-site iframe then immediately focusing back</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script>
function waitForEvent(target, event, checkFn) {
  return new Promise(resolve => {
    target.addEventListener(event, e => {
      if (checkFn && !checkFn(e)) {
        return;
      }
      resolve();
    }, { once: true });
  });
}

// This will send message to outer frame and also inner frame to ask them
// send the log they collect back, the logs of outer and inner will be
// concatenated.
async function getLog(w) {
  let log = "";
  step_timeout(function() {
    w.postMessage("getlog", "*");
  }, 0);
  await waitForEvent(window, "message", (e) => {
    log = e.data;
    return true;
  });
  return log;
}

// This will send message to outer frame to ask it's activeElement.
async function getActiveElement(w) {
  let activeElement = "";
  step_timeout(function() {
    w.postMessage("getActiveElement", "*");
  }, 0);
  await waitForEvent(window, "message", (e) => {
    activeElement = e.data;
    return true;
  });
  return activeElement;
}

promise_test(async t => {
  let w = window.open("support/activeelement-after-focusing-different-site-iframe-then-immediately-focusing-back-outer.sub.html");
  t.add_cleanup(() => { w.close(); });
  await waitForEvent(window, "message", e => e.data === "ready");
  w.postMessage("focus", "*");
  assert_equals(await getLog(w), 'outerlog:willfocusiframe,didfocusiframe,willfocusinput,inputfocus,didfocusinput,innerlog:windowfocus,windowblur,');
  assert_equals(await getActiveElement(w), 'INPUT');
}, "Check focus event and active element after focusing different site iframe then immediately focusing back");
</script>
