10 lines
261 B
HTML
10 lines
261 B
HTML
<html>
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<body>
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<script type="text/javascript" charset="utf-8">
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const popup = window.open();
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popup.document.write('<h1>Hello</h1>');
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const content = popup.document.querySelector('h1').innerText;
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window.postMessage(content, '*');
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</script>
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</body>
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</html>
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