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

::selection will override the background color once the selection is made, and will bring it back to the body{background-color: white;} once the text is deselected.
we just have to make sure to always give a proper color and background values to both the selection and the main style.