<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<iframe id="i"></iframe>
<body>
<script>
async_test(t => {
let starting_history_length = history.length;
let iframe_url = (new URL("/common/blank.html", location.href)).href;
i.src = iframe_url;
history.pushState("a", "", "#a");
assert_equals(history.length, starting_history_length + 1, "First history length");
i.onload = t.step_func(() => {
assert_equals(history.length, starting_history_length + 1, "Second history length");
assert_equals(i.contentWindow.location.href, iframe_url);
assert_equals(location.hash, "#a");
history.back();
// Wait a while for a back navigation. Since all of the possible outcomes
// are either same-document or navigating to about:blank, this doesn't need
// to wait terribly long.
t.step_timeout(t.step_func_done(() => {
assert_equals(location.hash, "", "top frame should have navigated back");
assert_equals(i.contentWindow.location.href, iframe_url, "iframe should not have navigated");
}), 100);
});
}, "pushState() in parent while child is doing initial navigation, then go back");
</script>
</body>
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