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<!DOCTYPE html> <html> <body> <form id="myForm"> Select your favorite fruit: <select> <option id="apple">Apple</option> <option id="orange">Orange</option> <option id="pineapple">Pineapple</option> <option id="banana">Banana</option> </select> </form> <p>Click the button to return the id of the form the apple option belongs to.</p> <button type="button" onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("apple").form.id; document.getElementById("demo").innerHTML = x; } </script> </body> </html>