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<!DOCTYPE html> <html> <body> <form id="myForm"> <select id="mySelect"> <option>Apple</option> <option>Pear</option> <option>Banana</option> <option>Orange</option> </select> </form> <p>The id of the form is:<p> <p id="demo"></p> <script> document.getElementById("demo").innerHTML = document.getElementById("mySelect").form.id; </script> </body> </html>