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<!DOCTYPE html> <html> <body> <h1>With "use strict":</h1> <h3>For security reasons, eval() is not allowed to create variables in the scope from which it was called.</h3> <p>Activate debugging in your browser (F12) to see the error report.</p> <script> "use strict"; eval ("var x = 2"); alert (x); // This will cause an error </script> </body> </html>