third_party/WebKit/LayoutTests/http/tests/security/secureContexts/resources/post-securecontext-status.html

<script>
    ["top", "parent", "opener"].forEach(function (x) {
        if (window[x] && window[x] != window)
            window[x].postMessage({ "isSecureContext": window.isSecureContext }, "*");
    });
</script>