<!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>