Do you ever wanted to have an HTML drop-down with default selected value (placeholder) that the user cannot re-select once they selected any valid value options? It can be done easily by adding selected and disabled attributes on the option element.
Code Snippet
<select>
<option value="" selected="selected" disabled="disabled">-- SELECT --</option>
<option value="ACTIVE">ACTIVE</option>
<option value="INACTIVE">INACTIVE</option>
</select>