개념
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리스트에서 ul을 중첩으로 사용하면 모양이 자동으로 변경된다.
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<ul>
<li>
<a href="#">HTML5</a>
<ul>
<li>Multimedia Tag</li>
<li>Connectivity</li>
<li>Device Access</li>
</ul>
</li>
<li>
<a href="#">CSS3</a>
<ol>
<li>
Animation
<ul>
<li>Test1</li>
<li>Test2</li>
</ul>
</li>
<li>
3D Transform
<ul>
<li>Test1</li>
<li>Test2</li>
<li>Test3</li>
</ul>
</li>
</ol>
</li>
</ul>
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