This is my code:
<div class="two-columns">
<div class="col-half">
<label for="city">Città</label>
<input type="text" name="city" class="required">
</div>
<div class="col-half">
<label for="province">Provincia</label><br>
<select name="province" class="required">
<option value="">Seleziona la provincia</option>
</select>
</div>
</div>
As you can see I put the "class required" in the dropdown because the user must choose a value. All works fine but I cannot see the alert message if I miss to select an item from the dropdown; the form is not sent, correct, but the alert is not shown. Any hints?