<!doctype html>
<meta charset="utf-8">
<title>Joint session history should not override parent's state.</title>
<meta name="timeout" content="long">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<iframe id="frame" src="about:blank"></iframe>
<script>
async_test(function(t) {
// Setup.
var initialState = {foo: 'bar'};
var newStateFromChild = {foo: 'baz'};
var child = document.getElementById("frame");
// Child's initial state should be a default empty state.
assert_equals(child.contentWindow.history.state, null);
// Perform navigation in the top-level container to set the state.
window.history.pushState(initialState, 'title');
// Validate initial state was properly set.
assert_object_equals(window.history.state, initialState);
child.onload = t.step_func_done(() => {
// Child's initial state should be `null`.
assert_equals(child.contentWindow.history.state, null);
// Navigate in the child.
child.contentWindow.history.pushState(newStateFromChild, 'title');
// Child's state should now equal the new state.
assert_object_equals(child.contentWindow.history.state, newStateFromChild);
// Parent's state should still be preserved, having exactly the same state as it
// had before parent navigated.
assert_object_equals(window.history.state, initialState);
})
child.src = "joint-session-history-filler.html";
});
</script>
</body>
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