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<!DOCTYPE html> <html> <body> <p>JavaScript objects are mutable.</p> <p>Any changes to a copy of an object will also change the original.</p> <p id="demo"></p> <script> var person = {firstName:"John", lastName:"Doe", age:50, eyeColor:"blue"} var x = person; x.age = 10; document.getElementById("demo").innerHTML = person.firstName + " is " + person.age + " years old."; </script> </body> </html>