HTML سمة مطلوبة

<form action="demo_form.asp">
  Username: <input type="text" name="usrname" required>
  <input type="submit">
</form>

<select required>
  <option value="">None</option>
  <option value="volvo">Volvo</option>
  <option value="saab">Saab</option>
  <option value="mercedes">Mercedes</option>
  <option value="audi">Audi</option>
</select>

<form action="demo_form.asp">
  <textarea name="comment" required></textarea>
  <input type="submit">
</form>