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