Nested Lists - li is a child of ul!

Keep in mind that the only allowed child of a ul element is an li element. So in a nested list, the nested ul needs to contained within the li:

CorrectIncorrect
ul must be within li
<ul>
<li>Tea
    <ul>
        <li>Kenyan</li>
        <li>Sikkim</li>
        <li>Ceylon</li>
        <li>Assam</li>
        <li>Oolong</li>
    </ul>
</li>
<li>Potato Chips
    <ul>
        <li>Dirty&apos;s</li>
        <li>Art&apos;s and Mary&apos;s</li>
        <li>Tim&apos;s Cascade</li>
        <li>Cape Cod</li>
    </ul>
</li>
</ul>
<ul>
<li>Tea</li>
    <ul>
        <li>Kenyan</li>
        <li>Sikkim</li>
        <li>Ceylon</li>
        <li>Assam</li>
        <li>Oolong</li>
    </ul>

<li>Potato Chips</li>
    <ul>
        <li>Dirty&apos;s</li>
        <li>Art&apos;s and Mary&apos;s</li>
        <li>Tim&apos;s Cascade</li>
        <li>Cape Cod</li>
    </ul>
</ul>

Sometimes this is confusing, since in the "HTML" form of HTML5, the end tags are options for li, so while it may appear that you can have a ul as a child of ul, you really can't -- there's an implied end-tag there.

Correct HTML serializationCorrect XML serialization
<ul>
<li>Tea
    <ul>
        <li>Kenyan
        <li>Sikkim
        <li>Ceylon
        <li>Assam
        <li>Oolong
    </ul>

<li>Potato Chips
    <ul>
        <li>Dirty&apos;s
        <li>Art&apos;s and Mary&apos;s
        <li>Tim&apos;s Cascade
        <li>Cape Cod
    </ul>

</ul>
<ul>
<li>Tea
    <ul>
        <li>Kenyan</li>
        <li>Sikkim</li>
        <li>Ceylon</li>
        <li>Assam</li>
        <li>Oolong</li>
    </ul>
</li>
<li>Potato Chips
    <ul>
        <li>Dirty&apos;s</li>
        <li>Art&apos;s and Mary&apos;s</li>
        <li>Tim&apos;s Cascade</li>
        <li>Cape Cod</li>
    </ul>
</li>
</ul>