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<!doctype html>
<script>
window.addEventListener("message", e => {
window.top.postMessage(e.data, "*");
});
</script>
<iframe src="secure-connection-test.html">
<!doctype html>
<script>
window.addEventListener("message", e => {
window.top.postMessage(e.data, "*");
});
</script>
<iframe src="secure-connection-test.html">