I wanted raid target markers to be shown on my frames, so I created a custom tag that uses a UI escape sequence to return a target marker for the unit.

function(u)
  local i = GetRaidTargetIndex(u)
  if i == nil then return "" end
  local t = format([[Interface\TARGETINGFRAME\UI-RaidTargetingIcon_%s]], i)
  return CreateTextureMarkup(t, 64, 64, 14, 14, 0, 1, 0, 1, 0, 0)
end

The problem that I encountered was that it renders with an odd outline, due to the custom implementation for font strings that GladiusEx uses, namely GladiusEx:CreateSuperFS.

I tried to remove the line GladiusEx\modules\tags.lua:319 and use the regular font string on GladiusEx\modules\tags.lua:318, which makes it render correctly.

Here's how it looks using GladiusEx:CreateSuperFS:

And here's with a regular font string:

Thanks 😄

Perhaps it would also be nice to allow texts larger than 20 (px?), setting the max value to 100 or something like that on GladiusEx\modules\tags.lua:758.