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<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>JS Document.body Demo</title> <script> alert("From HEAD: " + document.body); // Outputs: null (since <body> is not parsed yet) </script> </head> <body> <script> alert("From BODY: " + document.body); // Outputs: HTMLBodyElement </script> </body> </html>