use transition on ::-webkit-scrollbar?

Question

is it possible to use transitions on webkit scrollbars? I tried:

div#main::-webkit-scrollbar-thumb {
    background: rgba(255,204,102,0.25);
    -webkit-transition: background 1s;
    transition: background 1s;
}

div#main:hover::-webkit-scrollbar-thumb {
    background: rgba(255,204,102,1);
}

but it isn't working. Or is it possible to create a similar effect (without javascript)?

Here is a jsfiddle showing the rgba transition problem

Answer 1

It is fairly easy to achieve using Mari M's background-color: inherit; technique in addition with -webkit-background-clip: text;.

Live demo; https://jsfiddle.net/s10f04du/

@media screen and (-webkit-min-device-pixel-ratio:0) { 
  .container {
    overflow-y: scroll;
    overflow-x: hidden;
    background-color: rgba(0,0,0,0);
    -webkit-background-clip: text;
    transition: background-color .8s;
  }
  .container:hover {
    background-color: rgba(0,0,0,0.18);  
  }
  .container::-webkit-scrollbar-thumb {
    background-color: inherit;
  }
}