[(#REM) Affiche un exergue ]
[<[(#HTML5|?{aside,div})] class="exergue[ (#ENV{position}|=={left}|?{float-left})][ (#ENV{position}|=={right}|?{float-right})]">
        (#ENV{texte}|propre)
</[(#HTML5|?{aside,div})]>]