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<!DOCTYPE html> <html> <body> <object id="myObject" width="250" height="200" data="helloworld.swf" style="border:1px solid black"></object> <p>Click the button to change the width of the object element to 400px.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { document.getElementById("myObject").width = "400"; } </script> </body> </html>