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<!DOCTYPE html> <html> <body> Checkbox: <input type="checkbox" id="myCheck" value="myvalue"> <p>Click the "Try it" button to display the value of the value attribute of the checkbox.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myCheck").value; document.getElementById("demo").innerHTML = x; } </script> </body> </html>