List item tokens must appear at the beginning of line as lists aren't
allowed inside a preformatted box:
: foo -> <dl><dd> foo </dd></dl>
: foo -> <pre> : foo </pre>
However, if you put a table inside it, the list item token may appear
indented:
:{|
|foo
|} -> <dl><dd><table><tbody><tr><td>
foo
</td></tr></tbody></table></dd></dl>
/Andreas