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<!DOCTYPE html> <html> <body> <p>"use strict" in a function will only cause errors in that function.</p> <p>Activate debugging in your browser (F12) to see the error report.</p> <script> x = 3.14; // This will not cause an error. myFunction(); function myFunction() { "use strict"; y = 3.14; // This will cause an error (y is not defined). } </script> </body> </html>
