test_announcement.html

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<head>

  <title>Announcement event and method testing</title>

  <link rel="stylesheet" type="text/css"

        href="chrome://mochikit/content/tests/SimpleTest/test.css" />

  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>

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          src="../common.js"></script>

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          src="../role.js"></script>

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          src="../states.js"></script>

  <script type="application/javascript"

          src="../promisified-events.js"></script>

  <script type="application/javascript">

    async function doTests() {

      let acc = getAccessible("display");

      let onAnnounce = waitForEvent(EVENT_ANNOUNCEMENT, acc);

      acc.announce("please", nsIAccessibleAnnouncementEvent.POLITE);

      let evt = await onAnnounce;

      evt.QueryInterface(nsIAccessibleAnnouncementEvent);

      is(evt.announcement, "please", "announcement matches.");

      is(evt.priority, nsIAccessibleAnnouncementEvent.POLITE, "priority matches");

      onAnnounce = waitForEvent(EVENT_ANNOUNCEMENT, acc);

      acc.announce("do it", nsIAccessibleAnnouncementEvent.ASSERTIVE);

      evt = await onAnnounce;

      evt.QueryInterface(nsIAccessibleAnnouncementEvent);

      is(evt.announcement, "do it", "announcement matches.");

      is(evt.priority, nsIAccessibleAnnouncementEvent.ASSERTIVE,

        "priority matches");

      SimpleTest.finish();

    SimpleTest.waitForExplicitFinish();

    addA11yLoadEvent(doTests);

  </script>

</head>

<body>

  <a target="_blank"

     href="https://bugzilla.mozilla.org/show_bug.cgi?id=1525980"

     title="Introduce announcement event and method">

    Mozilla Bug 1525980

  </a>

  <p id="display"></p>

  <div id="content" style="display: none"></div>

  <pre id="test">

  </pre>

</body>

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