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<!DOCTYPE html>
<title>Return fullscreen feature policy state from self and a sandboxed child frame</title>
<script>
"use strict";
window.onload = () => {
let frame = document.createElement('iframe');
frame.src = "/feature-policy/resources/nested-sandbox.html";
frame.sandbox = "allow-scripts";
var handle_message = evt => {
if (evt.source === frame.contentWindow) {
window.parent.postMessage({
"child": document.featurePolicy.allowedFeatures().includes("fullscreen"),
"grandchild": evt.data
},"*");
document.body.removeChild(frame);
window.removeEventListener('message', handle_message);
}
};
window.addEventListener('message', handle_message);
document.body.appendChild(frame);
};
</script>
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