Why was ::selection removed from the CSS Selectors spec, and how does its specificity work against type selectors?

Question

Some questions about using CSS to specify the color of selected text:

1. https://developer.mozilla.org/En/CSS/::selection says that,

   :

Answer 1

The following style:

body { background-color: white }

applies to background color of your page.

On the other hand, this rule:

::selection { background-color: Highlight; color: HighlightText; }

applies styles when you select text on your page.

So they do completely different things and there is no question of collision between them.