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<!DOCTYPE html> <html> <body> <h2>With "use strict":</h2> <h3>Using a variable without declaring it, is not allowed.</h3> <p>Activate debugging in your browser (F12) to see the error report.</p> <script> "use strict"; x = 3.14; // This will cause an error (x is not defined). </script> </body> </html>
