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<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>