Allow custom list-style-type strings for unordered lists

With newer CSS it should be possible to define custom strings as symbols for lists instead of the default bullets: [https://drafts.csswg.org/css-lists/#text-markers](https://drafts.csswg.org/css-lists/#text-markers).
Would it be possible to get this to work?
Currently only some of the most basic symbols are rendered like bullet, circle, square, decimal, all others I attempted defaulted back to the bullet.
In most browsers this css would work:
```
ul {
list-style-type: "- ";
}
```