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<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>JavaScript Enable Strict Mode</title> </head> <body> <script> "use strict"; // All your code goes here x = 5; // ReferenceError: x is not defined console.log(x); </script> <p><strong>Note:</strong> Please check out the browser console by pressing the f12 key on the keyboard.</p> </body> </html>
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