User blog comment:MisterWoodhouse/The Unified Community Platform Editor and our first release date/@comment-25050130-20200309165702

Source Editor needs to have color highlights for when you add a command, or a template, or a font change. As its shown, not having that kind of highlight which we currently have in the present source editor would make tracking down errors or templates that arent closed up much harder for the editors.

The example given was for a white background page. I assume thats only cause that fandom has their background in white and that we arent limited to only white when in edit mode.