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<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>JavaScript Enable Strict Mode inside the Function</title> </head> <body> <script> x = 5; console.log(x); // 5 function sayHello() { "use strict"; str = "Hello World!"; // ReferenceError: str is not defined console.log(str); } sayHello(); </script> <p><strong>Note:</strong> Please check out the browser console by pressing the f12 key on the keyboard.</p> </body> </html>
