Template visual aide


I found a thread on something that helped you with templates or something, it was in the middle of the night and I have now forgotten it...

I'm wondering if anyone knows what it could be, description:

It helped you with a visual reference to where each template affected, I don't know if it was an addon, or just a style, but it would be very helpful.

It added tags to each part, and showed its templates name.

Thanks in advance
- Pathurs