in the second paragraph , https://www.w3.org/TR/css-display-3/#intro
what does the term "text run" mean? :

Each box in the box tree represents its corresponding element (or pseudo-element)
in space and/or time on the canvas, while each TEXT RUN in the box tree likewise represents
the contents of its corresponding text nodes.

after a lot of time trying to translate this term into my language, I think it may be a mistake and that this word "run" was added by mistake.