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<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=1256084
-->
<head>
  <meta charset="utf-8">
  <title>Test for Display Mode</title>
  <script src="chrome://mochikit/content/tests/SimpleTest/EventUtils.js"></script>
  <link rel="stylesheet" type="text/css" href="chrome://global/skin"/>
  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>
  <script type="application/javascript">
    var imports = [ "SimpleTest", "is", "isnot", "ok" ];
    for (var n of imports) {
      window[n] = window.opener.wrappedJSObject[n];
    }

    /** Test for Display Mode **/
    const {Services} = ChromeUtils.import("resource://gre/modules/Services.jsm");

    function waitOneEvent(element, name) {
      return new Promise(function(resolve, reject) {
        element.addEventListener(name, function() {
          resolve();
        }, {once: true});
      });
    }

    function promiseNextTick() {
      return new Promise(resolve => setTimeout(resolve, 0));
    }

    async function test_task() {
      var iframe = document.getElementById("subdoc");
      var subdoc = iframe.contentDocument;
      var style = subdoc.getElementById("style");
      var bodyComputedStyled = subdoc.defaultView.getComputedStyle(subdoc.body);
      var win = Services.wm.getMostRecentWindow("navigator:browser");

      var secondDiv = subdoc.getElementById("b");
      var offsetTop = secondDiv.offsetTop;

      // Test entering the OS's fullscreen mode.
      var fullScreenEntered = waitOneEvent(win, "sizemodechange");
      synthesizeKey("KEY_F11");
      await fullScreenEntered;

      // Wait for the next tick to apply media feature changes. See bug 1430380.
      await promiseNextTick();
      ok(offsetTop !== secondDiv.offsetTop, "offset top changes");
      var fullScreenExited = waitOneEvent(win, "sizemodechange");
      synthesizeKey("KEY_F11");
      await fullScreenExited;

      // Wait for the next tick to apply media feature changes. See bug 1430380.
      await promiseNextTick();
      ok(offsetTop === secondDiv.offsetTop, "offset top returns to original value");

      offsetTop = secondDiv.offsetTop;
      // Test entering fullscreen through document requestFullScreen.
      fullScreenEntered = waitOneEvent(document, "mozfullscreenchange");
      document.body.mozRequestFullScreen();
      await fullScreenEntered
      ok(offsetTop !== secondDiv.offsetTop, "offset top changes");
      fullScreenExited = waitOneEvent(document, "mozfullscreenchange");
      document.mozCancelFullScreen();
      await fullScreenExited;
      ok(offsetTop === secondDiv.offsetTop, "offset top returns to original value");

      window.close();
      window.SimpleTest.finish();
    }
  </script>
</head>
<body onload="test_task()">
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1256084">Mozilla Bug 1256084</a>
<iframe id="subdoc" src="http://mochi.test:8888/tests/layout/style/test/chrome/display_mode_reflow_iframe.html"></iframe>
<p id="display"></p>
<div id="content" style="display: none">

</div>
<pre id="test">
</pre>
</body>
</html>