Source Code:
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<!DOCTYPE html> <html> <head> <title>Title of the Document</title> </head> <body> <!-- comment --> <script> // for comment alert( document.body.firstChild.tagName ); // undefined, not an element alert( document.body.firstChild.nodeName ); // #comment // for document alert( document.tagName ); // undefined, not an element alert( document.nodeName ); // #document </script> </body> </html>
Result:
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