<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=1364364
-->
<head>
  <meta charset="utf-8">
  <title>Test for Bug 1364364</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
  <script type="application/javascript">

  /** Test for Bug 1364364 */
  let testWin, testDoc;
  async function test() {
    SimpleTest.waitForExplicitFinish();
    if (SpecialPowers.Services.appinfo.sessionHistoryInParent) {
      // This test relies on the possibility to modify the bfcached document.
      // The new implementation is more restricted and thus works only
      // when the bfcached browsing context is the only top level one
      // in the browsing context group.
      ok(true, "This test is for the old bfcache implementation only.");
      SimpleTest.finish();
      return;
    }
    testWin = window.open("file_bug1364364-1.html");
    await waitForLoad(testWin);
    testDoc = testWin.document;

    // file_bug1364364-1.html will load a few dynamic iframes and then navigate
    // top browsing context to file_bug1364364-2.html, which will postMessage
    // back.
  }

  function waitForLoad(win) {
    return new Promise(r => win.addEventListener("load", r, { once: true}));
  }

  window.addEventListener("message", async function(msg) {
    if (msg.data == "navigation-done") {
      is(testWin.history.length, 6, "check history.length");

      // Modify a document in bfcache should cause the cache being dropped tho
      // RemoveFromBFCacheAsync.
      testDoc.querySelector("#content").textContent = "modified";
      await new Promise(r => setTimeout(r, 0));

      is(testWin.history.length, 2, "check history.length after bfcache dropped");
      testWin.close();
      SimpleTest.finish();
    }
  });

  </script>
</head>
<body onload="test();">
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1364364">Mozilla Bug 1364364</a>
<p id="display"></p>
<div id="content" style="display: none">

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