User:Arcorann/Sandbox/styles.css

.__classed-list-v1{ counter-reset:idx1 }

.__classed-list-v1 > DIV{ counter-increment:idx1; padding-left:5em; }

.__classed-list-v1 > DIV::before, .__classed-list-v1 > :not(._notcounted)::before{ display:block; float:left; margin-left:-5em; width:4em; background:blue; padding-right:1em; content: counter(idx1)".";

}

.__classed-list-v1 > DIV._notcounted::before{ display:none; content:""; float:left; margin-left:-5em; width:4em; background:inherit; } .__classed-list-v1 > DIV._notcounted{ counter-increment: idx1 -1; }