<!DOCTYPE html>
<html>
<body>
<script src="/js-test-resources/js-test.js"></script>
<script>
description("Test blocking of top-level navigations by an iframe with `sandbox=allow-top-navigation-by-user-activation` when the user gesture is propagated from another context.");
jsTestIsAsync = true;
onload = () => {
    setTimeout(() => {
        internals.withUserGesture(() => {
            document.getElementsByTagName('iframe')[0].contentWindow.postMessage("foo", "*");
        });
        setTimeout(() => {
            testPassed("All navigations by subframes have been blocked");
            finishJSTest();
        }, 100);
    }, 10);
}
</script>
<iframe id="testFrame" src="http://localhost:8000/security/resources/navigate-top-level-frame-to-failure-page-via-message-handler.html" sandbox="allow-forms allow-pointer-lock allow-popups-to-escape-sandbox allow-popups allow-same-origin allow-scripts allow-top-navigation-by-user-activation"></iframe>
</body>
</html>