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<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>JavaScript Cannot Delete a Variable in Strict Mode</title> </head> <body> <script> "use strict"; var person = {name: "Peter", age: 28}; delete person; // SyntaxError </script> <p><strong>Note:</strong> Please check out the browser console by pressing the f12 key on the keyboard.</p> </body> </html>