CodePen Embed - Ví dụ kiểu 21

<ul>
		<li>
			<a href="#">Menu 1</a>
		</li>
		<li>
			<a href="#">Menu 2</a>
			<ul class="sub-menu">
				<li>..</li>
			</ul>
		</li>
	</ul>

ul > li a:only-child {
	   font-weight: bold;
	}

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