<!DOCTYPE html>
<html>
<body>
<script>
function isSameOriginAsTop()
{
    try {
        return self.origin == top.origin;
    } catch (e) {
        return false;
    }
}

let bc = new BroadcastChannel("broadcastchannel-partitioning");

if (location.origin == "http://127.0.0.1:8000") {
    if (isSameOriginAsTop())
        bc.postMessage("same-origin-iframe-under-same-origin-popup");
    else
        bc.postMessage("same-origin-iframe-under-cross-origin-popup");
} else {
    if (isSameOriginAsTop())
        bc.postMessage("cross-origin-iframe-under-cross-origin-popup");
    else
        bc.postMessage("cross-origin-iframe-under-same-origin-popup");
}
</script>
</body>
</html>