test_wakelock_on_initial_about_blank.html

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<html>

<head>

  <meta charset="utf-8">

  <title>Test requesting lock on the initial about:blank</title>

  <link rel="help" href="https://bugzilla.mozilla.org/1882344"/>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <link rel="stylesheet" href="/tests/SimpleTest/test.css"/>

  <script>

    add_task(async function test() {

      const iframe = document.createElement('iframe');

      iframe.src = "file_empty.html";

      document.documentElement.appendChild(iframe);

      // https://html.spec.whatwg.org/multipage/nav-history-apis.html#the-window-object:initialise-the-document-object

      is(iframe.contentWindow.location.href, "about:blank", "Initial about:blank is loaded");

      let lock;

      try {

        // request lock on initial about:blank

        lock = await iframe.contentWindow.navigator.wakeLock.request();

      } catch (err) {

        // This could happen if the initial about:blank document is inactive

        // once the async code in .request runs.

        ok(true, "request was rejected");

        return;

      if (iframe.contentWindow.location.href == "about:blank") {

        await new Promise((res, _rej) => { iframe.onload = res; });

      isnot(iframe.contentWindow.location.href, "about:blank", "Target document is loaded");

      is(lock.released, true, "lock was released by load of target doc");

      // window and wakeLock object stayed the same, but document changed

      await iframe.contentWindow.navigator.wakeLock.request();

      ok(true, "Was able to request lock on target document");

});

  </script>

</head>

<body>

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

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

<pre id="test"></pre>

</body>

</html>