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