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<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>