Bug 249457

Created attachment 464069 [details] Screenshot of container element where outline is drawn both outside container and in the scrolled container content. Steps to reproduce: Create a container element with `overflow:auto`, `perspective: 100px` and an outline. Add content that forces the container to be a scroll container. Add a positioned element that is translated in the Z direction and has z-index. I.e. `transform: translateZ(-100px)` `z-index: -1`. Codepen here: https://codepen.io/johannesodland/pen/QWxeepe Expected result: Outline should be drawn right outside border edge of container.. Actual result: Outline is drawn outside border edge of the container, and in the content. See screenshot.