What is wrong with the following nested list?
<ul>
<li>Item 1</li>
<li>Item 2
<ul>
<li>Sub-item 1</li>
</ul>
</ul>
What is wrong with the following nested list?
<ul>
<li>Item 1</li>
<li>Item 2
<ul>
<li>Sub-item 1</li>
</ul>
</ul>