This message currently has the code
Diff selection: Mark the radio boxes of the revisions to compare and hit enter or the button at the bottom.<br /> Legend: '''({{int:cur}})''' = difference with latest revision, '''({{int:last}})''' = difference with preceding revision, '''{{int:minoreditletter}}''' = minor edit.
but it would be better (semantically) to mark it like this:
Diff selection: Mark the radio boxes of the revisions to compare and hit enter or the button at the bottom.<br /> Legend: <dl> <dt>({{int:cur}})<dt> <dd>difference with latest revision,</dd> <dt>({{int:last}})<dt> <dd>difference with preceding revision,</dd> <dt>{{int:minoreditletter}}</dt> <dd>minor edit.</dd> </dl>
(possibly using the "hlist" class from T42062 to make it show up horizontally)