Renderer supports counter-reset but not counter-set

You can test this in the sandbox :

```

li {
list-style-type: none;
}

li::before {
counter-increment: item;
content: counters(item, ".") ". ";
}

1. test


2. test


3. test


4. test

```

The styling does not work, but `counter-reset: item 4` does.