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<!DOCTYPE html> <html> <body> <form> <select id="mySelect" size="8"> <option>Apple</option> <option>Pear</option> <option>Banana</option> <option>Orange</option> </select> </form> <br> <p>Click the button to add a "Kiwi" option at the end of the dropdown list.</p> <button type="button" onclick="myFunction()">Insert option</button> <script> function myFunction() { var x = document.getElementById("mySelect"); var option = document.createElement("option"); option.text = "Kiwi"; x.add(option); } </script> </body> </html>