iframe-synchronously-discard.html

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This WPT test may be referenced by the following Test IDs:
- /html/semantics/embedded-content/the-iframe-element/iframe-synchronously-discard.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset=utf-8>

<title>IFrame discards are processed synchronously</title>

<body></body>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script>

  async_test(function(t) {

    var child = document.createElement("iframe");

    child.src = "support/blank.htm?1";

    child.onload = t.step_func(function () {

      var childWindow = child.contentWindow;

      var grandchild = childWindow.document.createElement("iframe");

      grandchild.src = "blank.htm?2";

      grandchild.onload = t.step_func(function () {

        var grandchildWindow = grandchild.contentWindow;

        assert_equals(child.contentWindow, childWindow, "child window");

        assert_equals(childWindow.parent, window, "child parentage");

        assert_equals(grandchild.contentWindow, grandchildWindow, "grandchild window");

        assert_equals(grandchildWindow.parent, childWindow, "grandchild parentage");

        document.body.removeChild(child);

        assert_equals(child.contentWindow, null, "child should be discarded");

        assert_equals(childWindow.parent, null, "child window should be discarded");

        assert_equals(grandchild.contentWindow, null, "grandchild should be discarded");

        assert_equals(grandchildWindow.parent, null, "grandchild window should be discarded");

        t.done();

});

      childWindow.document.body.appendChild(grandchild);

});

    document.body.appendChild(child);

});

</script>