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<!DOCTYPE html> <html> <head> <script> function selectMultiple() { document.getElementById("mySelect").multiple = true; } </script> </head> <body> <form> <select id="mySelect" size="4"> <option>Apple</option> <option>Pear</option> <option>Banana</option> <option>Orange</option> </select> <input type="button" onclick="selectMultiple()" value="Select multiple"> </form> <p>Before you click "Select multiple", you cannot select more than one option (by holding down the Shift or Ctrl key).</p> <p>After you have clicked "Select multiple", you can.</p> </body> </html>