I am working on a syntax style table editor, see issue for some background about this.
18322 Settings for Syntax Highlighting a bit confusing
15409 A more complete set of syntactic colors is needed
And open the preview/editor with:
STStylerPreview open.
This is a prototype, you can view builtin style tables, create and edit new custom style tables.
code preview pane, and it supports more styling attributes than the default styler.