/Html/Selectpicker dropdown in bootsttrap

Selectpicker dropdown in bootsttrap

<select class="selectpicker" required multiple>
  <optgroup label="Picnic">
    <option>Mustard</option>
    <option>Ketchup</option>
    <option>Relish</option>
  </optgroup>
  <optgroup label="Camping">
    <option>Tent</option>
    <option>Flashlight</option>
    <option>Toilet Paper</option>
  </optgroup>
</select>

Source: developer.snapappointments.com

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