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<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>