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<!DOCTYPE html> <html> <body> <h3>A demonstration of how to access a File Upload Button</h3> <input type="file" id="myFile"> <p>Click the "Try it" button to disable the file upload button.</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { var x = document.getElementById("myFile"); x.disabled = true; } </script> </body> </html>