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<!DOCTYPE html> <html> <body> <form> What color do you prefer?<br> <input type="radio" name="colors" id="red">Red<br> <input type="radio" name="colors" id="blue">Blue </form> <button onclick="check()">Check "Red"</button> <button onclick="uncheck()">Uncheck "Red"</button> <script> function check() { document.getElementById("red").checked = true; } function uncheck() { document.getElementById("red").checked = false; } </script> </body> </html>