With WEBGL and type, I have sometimes a bug > a black background appear in the letterbox (the «M» in my print screen).
Thank you but I’m working with P5 and I don’t find «textMode»
WEBGL on p5.js is still under development (if I understand correctly) so, for example, this is perhaps not implemented. An “easy” fix is to use an additive filter to blend them
If you want “proper” rendering, perhaps you need to generate meshes from points of the contour of texts - I found this example fascinating