#HTTP_HEADER{Content-Type: text/css; charset=iso-8859-15}
#HTTP_HEADER{Vary: Accept-Encoding}

.vignette_extension {
	background-image:url([(#CHEMIN{prive/vignettes/defaut.svg}|url_absolue)]);
	background-repeat:no-repeat;
	background-position: center left;
}
<BOUCLE_vignettes(DATA){source table, #VAL{prive/vignettes/}|find_all_in_path{[.]svg$}}>
#SET{ext,#VALEUR|basename|explode{'.'}|reset}[(#REM)
][(#GET{ext}|!={defaut}|?{.vignette_extension.#GET{ext} \{ background-image:url([(#VALEUR|url_absolue)]) \}}][(#REM)
]</BOUCLE_vignettes>