<!DOCTYPE html>
<style>
div::after {
content: counter(n, cjk-decimal);
}
</style>
<div style="counter-reset: n 0;"></div>
<div style="counter-reset: n 1;"></div>
<div style="counter-reset: n 2;"></div>
<div style="counter-reset: n 3;"></div>
<div style="counter-reset: n 4;"></div>
<div style="counter-reset: n 5;"></div>
<div style="counter-reset: n 6;"></div>
<div style="counter-reset: n 7;"></div>
<div style="counter-reset: n 8;"></div>
<div style="counter-reset: n 9;"></div>
<div style="counter-reset: n 10;"></div>
<div style="counter-reset: n 11;"></div>
<div style="counter-reset: n 99;"></div>
<div style="counter-reset: n 100;"></div>
<div style="counter-reset: n 6001;"></div>
<div style="counter-reset: n 12345;"></div>
<div style="counter-reset: n -1;"></div>