@MacEachaidh:
<dt> &
<dd> are tags used for creating
definition lists in HTML
I've used
<dl>/
<dt>/
<dd> for drama (and also for endnotes). One big advantage is that the fallback formatting for reader systems that don't support CSS works well. With CSS, you can format them any way you like, of course, but I think it's a good idea to have something similar to the default, since screen width is a limited resource on most e-readers.
Remember to avoid page breaks after
<dt> with
page-break-after:avoid or an equivalent solution. Avoiding page-breaks inside the
<dd>'s as well is something to consider.
An example of how I've used
<dl> in dramas is
here (in Norwegian, but CSS is CSS, wherever in the world you are)