ol{counter-reset:item}ol>li{display:block;position:relative}ol>li:before{content:counters(item,".") " ";counter-increment:item;position:absolute;left:-2em}li ol{counter-reset:sub-item}li ol>li{display:block;position:relative;margin-left:2em}li ol>li:before{content:counters(item,".") "." counters(sub-item,".") " ";counter-increment:sub-item;position:absolute;left:-3em}