Platonides wrote:
<span style="vertical-align: top">Some text</span>
If you can do it with HTML, you almost always can do it in the wiki. If you can't do it in HTML, you probably can't do it in the wiki.
Annoyingly, HTML's align="top" and CSS's "vertical-align: top" aren't quite the same thing and aren't guaranteed to give the same results. The former works well with text, the latter with images. Anything else seems to be a crap shoot.
Mike