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<!DOCTYPE html> <html> <body> <h3>A demonstration of how to access a Radio Button</h3> Radio Button: <input type="radio" id="myRadio"> <p>Click the "Try it" button to check the radio button.</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { var x = document.getElementById("myRadio"); x.checked = true; } </script> </body> </html>