What I'm particularly wondering is how expensive `*:after` would be, resource-wise.
Would the pseudo element become the key selector in this case? Or would the client grab all the elements anyway?

In other words, what's the difference between the `*:after` and `*` performance-wise?

---

[edited. stupid example. my bad.]

For clarification, I'm trying my hand at drawing sth using only css and found myself using a lot of pseudo elements. Just wandering if I can save myself some time by writing 

```css
*:after, 
*:before {
   content:'';
}

```

and its resource cost.

Thanks.