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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Check that sandboxed iframe cannot perform navigation on the top
frame when allow-top-navigation is not set</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<script>
// We are the main test page. Open a popup, so that we can
// can experiment navigation of the top frame.
async_test(t => {
window.addEventListener("message", t.step_func_done(e => {
assert_equals(e.data, "cannot navigate");
e.source.close();
}));
window.open('support/load-into-the-iframe.html');
}, "Frames without `allow-top-navigation` should not be able to navigate the top frame.");
</script>
</body>
</html>
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