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