Webkit : Css text selection styling can not make background white?

Question

So text selection was made stylable trough the ::selection pseudo element in order to override the browser's default selection color. But to me, it seems that white as a selection background color is forbidden in favor of a greyish, opaque color.

::selection      { color: black;  background: white; }
::-moz-selection { color: black;  background: white; }

body {
    background: black;
    color: white;
}

So selecting me is supposed to invert the text and background colors. But the selected text background color is not white, but grey.

Why does this not create a perfectly white background ? Instead, it shows a grey background (#989898)

Also see this snippet on https://jsfiddle.net/duk3/hzodm1sh/

Answer 1

Ok so following this question I found the answer :

For some reason Chrome forces it to be semi-transparent. However, you can get around this by setting the background using rgba. I have set the alpha value to be just 0.01 less than 1.

::selection { color: black;  background: rgba(255, 255, 255, 0.996);
; }

body {
    background: black;
    color: white;
}

Selecting me DOES invert the text and background colors. Well, almost, but it looks like perfect white.