Can you put other tags in the HTML ul, such as H3, p?

According to the standard, UL inside should only put Li, but see colleagues have put H3, p these, so in the end can?

<ul> inside can only put <li>
But <li> can put
UL inside put other labels, not only does not conform to the semantics, in the ie7-inside also will have the question:
If the <other> tag is preceded by a <li> tag, the browser will assume that <other> is the child node of <li>. For example, <span><div></div></span> is not possible, when different browsers will have their own strategy to deal with these things.

Can you put other tags in the HTML ul, such as H3, p?