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<!DOCTYPE html> <html> <body> <input type="button" id="myBtn" value="My Button"> <br> <button onclick="disableBtn()">Disable "My Button"</button> <button onclick="undisableBtn()">Undisable "My Button"</button> <script> function disableBtn() { document.getElementById("myBtn").disabled = true; } function undisableBtn() { document.getElementById("myBtn").disabled = false; } </script> </body> </html>