<!DOCTYPE html>
<style>
span span span::before {
counter-increment: item;
content: counter(item, -moz-thai) "." counter(item, -moz-thai) "." counter(item, -moz-thai);
content: counter(item, thai) "." counter(item, thai) "." counter(item, thai);
}
</style>
<span><span><span></span></span></span>