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<!DOCTYPE html>
<input id="target" value="This should be focused!" autofocus></input>
<script>
let got_focus = false;
target.addEventListener("focus", () => got_focus = true);
window.addEventListener("load", () => {
parent.postMessage("grand_child_loaded", "*");
});
window.addEventListener("message", event => {
if (event.data == "report_focus_state") {
let msg = got_focus ? "grand_child_is_focused" : "grand_child_is_not_focused";
parent.postMessage(msg, "*");
}
});
</script>