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<!DOCTYPE html> <html> <body> <form id="myForm"> <input type="number" id="myNumber" value="2"> </form> <p>Click the button to return the id of the form the number field belongs to.</p> <button onclick="myFunction()">Try it</button> <p><strong>Note:</strong> input elements with type="number" are not supported in IE 9 and earlier versions.</p> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myNumber").form.id; document.getElementById("demo").innerHTML = x; } </script> </body> </html>