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<!DOCTYPE html> <html> <body> <form id="myForm"> <label id="myLabel" for="male">Male</label> <input type="radio" name="sex" id="male" value="male"><br> </form> <p>Click the "Try it" button to return the id of the form the label belongs to.</p> <p id="demo"></p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { var x = document.getElementById("myLabel").form.id; document.getElementById("demo").innerHTML=x; } </script> </body> </html>