[Feature proposal] Add support for ::selection

[robbevp]

It would be nice to be able to custimize the pseudo-selector ::selection

I imagine this to be added as a variant that can be added for the supported properties.
By default this should be disabled for all properties (or maybe only enabled for background-color)

I could take a stab at this if this would be something that could be added.

[royvanv]

My proposal would be to add an opt-in pseudo selector variant (selection) to use with background-color and color.

<p class="selection:text-white selection:bg-black">Select this text.</p> 

/** For each text color it adds a class */
.selection:text-white::selection {
   color: #fff; 
}

/** For each background color it adds a class */
.selection:bg-black::selection {
   color: #000; 
}

[jenstornell]

I would have needed it today. I think background color and text color are needed for both dark and bright selections.