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<!DOCTYPE html> <html> <body> <h1>With "use strict":</h1> <h3>Writing to a read-only property is not allowed.</h3> <p>Activate debugging in your browser (F12) to see the error report.</p> <script> "use strict"; var obj = {}; Object.defineProperty(obj, "x", {value:0, writable:false}); obj.x = 3.14; // This will cause an error </script> </body> </html>