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<!DOCTYPE html> <html> <body> Radio Button: <input type="radio" id="myRadio"> <button onclick="disable()">Disable radio button</button> <button onclick="undisable()">Undisable radio button</button> <script> function disable() { document.getElementById("myRadio").disabled = true; } function undisable() { document.getElementById("myRadio").disabled = false; } </script> </body> </html>