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<!DOCTYPE html> <html> <body> <h3>A demonstration of how to access a BUTTON element</h3> <p>Click to disable the BUTTON element:</p> <button type="button" id="myBtn" onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myBtn"); x.disabled = true; } </script> </body> </html>