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<!DOCTYPE html> <html> <body> <embed id="myEmbed" src="helloworld.swf" width="200" height="200" style="border:1px solid"> <p>Click the button to return the width of the flash animation.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myEmbed").width; document.getElementById("demo").innerHTML = x; } </script> </body> </html>