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<!DOCTYPE html>
<meta charset="utf-8">
<script>
let result;
try {
parent.document.getElementsByClassName('script');
result = 'iframe not sandboxed'
} catch (e) {
result = 'iframe sandboxed(' + e.message + ')';
}
window.onmessage = m => {
window.parent.postMessage({
result: result
}, '*');
};
</script>