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<html><body><form id="myForm">Checkbox: <input type="checkbox" id="myCheck"></form><p>Click the "Try it" button to display the id of the form the checkbox belongs to.</p><button onclick="myFunction()">Try it</button><p id="demo"></p><script>function myFunction() { var x = document.getElementById("myCheck").form.id; document.getElementById("demo").innerHTML = x;}</script></body><!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_checkbox_form by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 21 Dec 2022 18:16:54 GMT --></html>