test_bug851485.html

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<html>

<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=851485

-->

<head>

  <meta charset="utf-8">

  <title>Test for Bug 851485</title>

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

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

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

  <script type="application/javascript">

  /** Test for Bug 851485 **/

SimpleTest.waitForExplicitFinish();

var testRunning = false;

async function runTest() {

  if (testRunning) {

    return;

  testRunning = true;

  var e = document.getElementsByTagName('iframe')[0];

  var win = e.contentWindow;

  var p = new Promise((r) => { win.addEventListener("hashchange", r, { once: true }); });

  win.location.hash = '#anchor';

  await p;

  win.scrollTo(0, 500);

  p = new Promise((r) => { e.addEventListener("load", r, { once: true }); });

  win.location.reload();

  await p;

  is(win.location.hash, "#anchor", "We set the location's hash to 'anchor'");

  // Allow a half pixel difference because the scroll position is aligned with

  // screen pixels instead of CSS pixels (bug 1774315).

  isfuzzy(win.scrollY, 500, 0.5, "Reloading keeps scroll position");

  var link = win.document.getElementsByTagName('a')[0];

  var anchor = win.document.getElementsByTagName('a')[1];

  p = new Promise((r) => {

    var observer = new IntersectionObserver((entries) => {

      info("IntersectionObserver: entering callback")

      if (entries.some((entry) => entry.isIntersecting)) {

        info("IntersectionObserver: some entry isIntersecting; disconnecting")

        observer.disconnect();

        r();

});

    observer.observe(anchor);

});

  win.document.body.offsetHeight;

  synthesizeMouseAtCenter(link, {type: "mousedown"}, win);

  synthesizeMouseAtCenter(link, {type: "mouseup"}, win);

  info("Sending click")

  sendMouseEvent({type: "click"}, link, win);

  await p;

  let actualScroll = win.scrollY;

  info("Promise resolved (for IntersectionObserver). win.scrollY is " +

       actualScroll);

  ok(actualScroll > 3000, "Scrolling after load works.");

  SimpleTest.finish();

  </script>

</head>

<body>

<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=851485">Mozilla Bug 851485</a>

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

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

</div>

<pre id="test">

</pre>

<iframe src="file_bug842853.html"></iframe>

<script>

</script>

</body>

</html>