Edit The Code:
See Result »
Try it Yourself - ©
w3ii.com
<!DOCTYPE html> <html> <body> <h1>With "use strict":</h1> <h3>Duplicating a parameter name is not allowed.</h3> <p>Activate debugging in your browser (F12) to see the error report.</p> <script> "use strict"; function x(p1, p1) {}; // This will cause an error </script> </body> </html>