Can I use a div inside a list item?

问题:

Why is the following code valid when I am using a <div> inside a <li>?

<ul>
    <li class="aschild">
        <div class="nav">Test</div>
    </li>
</ul>

回答1:

Yes you can use a div inside a li and it will validate.

<!ELEMENT li %Flow;>
<!ENTITY % Flow "(#PCDATA | %block; | form | %inline; | %misc;)*">
<!ENTITY % block     "p | %heading; | div | %lists; | %blocktext; | fieldset | table">

回答2:

Inside a <li> you can have anything you could naturally put inside a <div>. They are no different in this sense.

It should be valid in HTML4, XHTML and HTML5 as well.

This is NOT valid though (so the sources you found about "no divs in lists" could refer to this situation):

<ul>
    <li></li>
    <div></div>
    <li></li>
</ul>

So: Lists (ul, ol) can only have lis as their children. But lis can have anything as their children.

回答3:

Because <li> is a block element, not an inline element like <span> or <a>.

回答4:

An <li> is a block element, and will work perfectly fine with other block elements inside.

回答5:

Yes, you can. As much as you want.