Question Add custom pseudo-classes

Hello,

I'm trying to allow UXML integrators to easily create table where odd rows have different color than even rows. In CSS, something like this would work :

Code (JavaScript):

1.  
2. table tr:nth-child(even) {
3.   background: blue;
4. }
5.  
6. table tr:nth-child(odd) {
7.   background: #f8f8f8;
8. }
9.  

But `:nth-child` does not seem to exist in USS yet following the official documentation Unity - Manual: Pseudo-classes (unity3d.com)

I've seen there is an internal class `StyleSelector` which would do that, but it is inaccessible.

How can I add my own pseudo-classes then and expose them in USS like in CSS?

 

This may be helpful:
https://twitter.com/shanecelis/status/1577249690797719553

 

Interesting, not really as friendly as CSS pseudos are. I found that really sad Unity does not integrated those main CSS feature yet...