Now, view the resulting page in old Edge, Firefox take a screenshot, and put it in a paint program, use a eyedropper, and see what color the browser made the box. The correct answer is #ff8000 (obviously). The Edge (dev) shows the color as #e08808. Obviously, this is wrong.
Previously, you could fix this by going to "edge://flags/#force-color-profile" and setting it to "sRGB". This option no longer exists in Edge (dev). As a result this went from "incorrect default behavior" to "incorrect default behavior that cannot be fixed with a setting". Should someone file a bug report with this, or ...?