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<!doctype html>
<script>
window.onmessage = (e) => {
if (e.data === 'What is document.fullscreenEnabled?') {
e.source.postMessage(document.fullscreenEnabled, '*');
} else {
e.source.postMessage('Incorrect message', '*');
}
}
</script>
<p>This page echos document.fullscreenEnabled.</p>
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