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<script>
// Forward message from the openee toward the parent.
window.addEventListener("message", event => top.postMessage(event.data, "*"));
let check_sandboxed = `"
<script>
try {
document.domain = document.domain;
opener.postMessage('allow-document-domain', '*');
} catch (error) {
opener.postMessage('disallow-document-domain', '*');
}
</scr`+`ipt>
"`;
window.open('about:blank', "window_name");
window.open("javascript:" + check_sandboxed, "window_name");
</script>