Is anything except LI’s allowed in a UL?

Question

According to the HTML 4 specs, the XHTML 2 specs and the HTML 5 specs that code is invalid.

<!ELEMENT UL – – (LI)+

This means that inside a <ul> there can only be multiple <li> elements.

Both types of lists (ul|ol) are made up of sequences of list items defined by the li element.

HTML 5

Content model:
Zero or more li and script-supporting elements.

Note that script-supporting elements are elements that are not rendered, and currently include only <script> and <template>.