Up to which point is nameplate modification allowed?

[seyan777]

I am on my newest journey to modify the Blizzard's default nameplate.

Currently the project includes:

• Custom aura frame
• Health percentage text
• Texture update
• So on

Afaik, the nameplate modification has been partially(?) blocked in instances like dungeon or raid.

Is there any documentation that lists such things? or Is it basically every single modification that is blocked?