Comma-Separated Lists

Separate list elements with commas but not the last one:

```css
ul > li:not(:last-child)::after {
  content: ",";
}
```
### Example

* Hello,
* There,
* Comma

Source: [AllThingsSmitty](https://github.com/AllThingsSmitty/css-protips#comma-separated-lists)

Victor Velazquez
February 14, 2021