select + option + optgroup element

with label

with label + selected on option a

with label + required

with label + disabled

with size attribute

with size + multiple attribute

with label and optgroup

Code

<label> choose
	<select>
		<optgroup label="part 1">
			<option value="1">a</option>
			<option value="2">b</option>
		</optgroup>
		<optgroup label="part 2">
			<option value="1">a</option>
			<option value="2">b</option>
		</optgroup>
	 </select>
</label>

Reference