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<!DOCTYPE html> <html> <body> <h3>A demonstration of how to access a KEYGEN element</h3> <keygen id="myKeygen" name="security"> <p>Click the button to disable the keygen field.</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { var x = document.getElementById("myKeygen"); x.disabled = true; } </script> </body> </html>