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<!DOCTYPE html> <html> <body> Checkbox:<input type="checkbox" id="myCheck" checked> <p>Click the "Try it" button to find out if the checkbox is checked by default.</p> <button type="button" onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myCheck").defaultChecked; document.getElementById("demo").innerHTML = x; } </script> </body> </html>