[Webkit-unassigned] [Bug 139381] New: ::-webkit-scrollbar continues to not support transitions

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=139381

            Bug ID: 139381
           Summary: ::-webkit-scrollbar continues to not support
                    transitions
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: PC
                OS: Windows 7
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: Sean.Palmer.Anderson at gmail.com
                CC: dino at apple.com

Transitions became supported on pseudo-selectors fairly recently. However, transitions do not appear to be supported on the ::-webkit-scrollbar (et. al) selectors.

I expect background-color to transition when hovering over a scrollbar with a transition applied to it.

Example: http://codepen.io/Meo/pen/EaPvwV

Code: 

<div class='parent'>
  <div class='child'>
  </div>
</div>

.parent {
  height: 100px;
  width: 100px;
  overflow-y: scroll;
  overflow-x: hidden;
}

.child {
  width: 200px;
  height: 200px;
}

::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-thumb {
  transition: all 5s linear;
  -webkit-transition: all 5s linear;
  background-color: blue;
}

::-webkit-scrollbar-thumb:hover {
  background-color: gray;
}

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