JSFiddle - React, Tailwind, and code Playground

HTML

<form id="test" action="Javascript: alert('Passed Validation')" method="get">
		<select required="required">
			<option value="">Select</option>
			<optgroup label="First">
				<option value="A">1</option>
				<option value="B">2</option>
				<option value="C">3</option>
				<option value="D">4</option>
			</optgroup>
			<optgroup label="Second">
				<option value="1">A</option>
				<option value="2">B</option>
				<option value="3">C</option>
				<option value="4">D</option>
			</optgroup>
		</select>
		<input type="submit" value="Click" />
    </form>