No the text is the abstraction. Or perhaps neither is the abstraction and they are just equivalent concepts like how uno is the same thing as one. Uno is spanish, one is English… there is no hierarchy where one concept is an abstraction over the other.
The main point of my post is to suggest that there are other equivalent concepts between text and box/line.
I think we are operating on different definitions of abstractions/concepts, here. My guess is you are trying to invoke a very specific meaning of "abstraction" in another context.
To note, most text is a symbolic representation of spoken words and words are abstractions of any number of things. Both physical things such as "running" and less physical things such as "thinking." (Yes, legographic texts exist, such that they may not be representing spoken words, but I fail to see how that changes things here?)
Abstractions go over things. An abstraction is something fundamentally layered on top of another thing. Two things cannot be abstractions of each other. If you encounter such a concept and you still think they are both abstractions then it is you who is not making sense.
If you don’t know what I’m talking about I’m sorry I can’t help you. Truly I’m really sorry and I apologize that I can’t help you. Thanks you reading. Good bye.