CSS counters is not supported

[hjue]

My Input is

<style>
body {
    counter-reset: section;
}
h2::before {
    counter-increment: section;
    content:counter(section);
}
</style>
<h2> Title 1</h2>
<h2> Title 2</h2>

Juice output

I hope Juice output

<h2><span>1</span> Title 1</h2>
<h2><span>2</span> Title 2</h2>

[Jarrett Widman]

If someone wants to open a PR to implement counters that would be amazing. Minimally, I'd like to fix the first and last character being cut off and the documentation being unclear that only plain text is supported for ::before and ::after.

[优秀的大鹏]

Expecting...

[Mike Voets]

The first and last character being cut off is still a problem.