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<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>