form.html

<form>
  <label for="zip">Zip:</label>
  <input id="zip" name="zip"/>
  <label for="city">City:</label>
  <div id="city-input-wrapper"><!-- wrap the city input so we can change to a dropdown if necessary -->
    <input id="city" name="city"/>
  </div>
  <label for="state">State:</label>
  <input id="state" name="state"/>
</form>