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<!DOCTYPE html> <html> <body> Checkbox: <input type="checkbox" id="myCheck"> <button onclick="check()">Check Checkbox</button> <button onclick="uncheck()">Uncheck Checkbox</button> <script> function check() { document.getElementById("myCheck").checked = true; } function uncheck() { document.getElementById("myCheck").checked = false; } </script> </body> </html>