<!DOCTYPE html>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=1716762
-->
<head>
<meta charset="utf-8">
<title>Test for Bug 1716762</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1716762">Mozilla Bug 1716762</a><br>
<input></input><br>
<div id="target" style="display: none;">
<iframe src="http://example.org/tests/dom/base/test/file_focus_display_none_xorigin_iframe_inner.html"></iframe>
</div>
<script type="text/javascript">

let waitForMessage = function(aMsg) {
  return new Promise(reslove => {
    window.addEventListener("message", function handler(e) {
      info(`main received message: ${e.data}`);
      if (e.data === aMsg) {
        window.removeEventListener("message", handler);
        reslove();
      }
    });
  });
};

let sendMessage = async function(aWindow, aMsg) {
  aWindow.postMessage(aMsg, "*");
  await waitForMessage("done");
}

let getFocus = function(aWindow) {
  return new Promise(reslove => {
    window.addEventListener("message", function handler(e) {
      info(e.data);
      reslove(e.data);
    }, { once: true });
    aWindow.postMessage("getfocus", "*");
  });
}

/** Test for Bug 1716762  **/

let input = document.querySelector("input");
let iframe = document.querySelector("iframe");

add_task(async function test_ancestor_display_none_init() {
  // focus input element
  input.focus();
  is(document.activeElement.tagName, "INPUT", "focus should move to input element");

  // focus input element in hidden iframe
  await sendMessage(iframe.contentWindow, "focus");
  is(document.activeElement.tagName, "INPUT", "focus should stay on input element");
});

add_task(async function test_remove_ancestor_display_none() {
  // remove `display: none` from the ancestor of iframe
  document.getElementById("target").style = "";
  document.body.offsetWidth;

  // focus input element
  input.focus();
  is(document.activeElement.tagName, "INPUT", "focus should move to input element");

  // focus input element in hidden iframe
  await sendMessage(iframe.contentWindow, "focus");
  is(document.activeElement.tagName, "IFRAME", "focus should move to iframe element");
});

add_task(async function test_ancestor_display_none() {
  // add `display: none` to the ancestor of iframe back
  document.getElementById("target").style = "display: none;";
  document.body.offsetWidth;

  // focus input element
  input.focus();
  is(document.activeElement.tagName, "INPUT", "focus should move to input element");

  // focus input element in hidden iframe
  await sendMessage(iframe.contentWindow, "focus");
  is(document.activeElement.tagName, "INPUT", "focus should stay on input element");
});

add_task(async function test_remove_ancestor_display_none_again() {
  // remove `display: none` from the ancestor of iframe
  document.getElementById("target").style = "";
  document.body.offsetWidth;

  // focus input element
  input.focus();
  is(document.activeElement.tagName, "INPUT", "focus should move to input element");

  // focus input element in hidden iframe
  await sendMessage(iframe.contentWindow, "focus");
  is(document.activeElement.tagName, "IFRAME", "focus should move to iframe element");
});

add_task(async function test_iframe_display_none() {
  // add `display: none` to iframe
  iframe.style = "display: none;";
  document.body.offsetWidth;

  // focus input element
  input.focus();
  is(document.activeElement.tagName, "INPUT", "focus should move to input element");

  // focus input element in hidden iframe
  await sendMessage(iframe.contentWindow, "focus");
  is(document.activeElement.tagName, "INPUT", "focus should stay on input element");
});

add_task(async function test_remove_iframe_display_none() {
  // remove `display: none` from iframe
  iframe.style = "";
  document.body.offsetWidth;

  // focus input element
  input.focus();
  is(document.activeElement.tagName, "INPUT", "focus should move to input element");

  // focus input element in hidden iframe
  await sendMessage(iframe.contentWindow, "focus");
  is(document.activeElement.tagName, "IFRAME", "focus should move to iframe element");
});

</script>
</body>
</html>
