RGB Animation for Text Highlight Color on Webpages

[Tanvir1337x]

Description

Support for RGB animations within the ::selection pseudo-element to allow smooth transitions in text highlight colors. Something like this (as seen on wikiwand pages when highlighting text):

RGB_TEXT_HIGHLIGHT.mp4

Currently, the highlight color remains static, with no capability to animate color transitions during text selection. The code is (in userContent.css):

/* Text Highlight color on webpages */
@-moz-document regexp("http(s)?:.*") {
  ::selection {
    background-color: transparent !important;
    color: #c38f8f !important;
  }
}

Which looks like this:

Problem !!

Achieving this effect appears to require JavaScript. Attempts using only CSS haven't worked. Have to explore userChrome.js/userContent.js.