Macros, how to determine/monitor the status..?

Question

Programming

For example, there is a window 600 * 50

when a red square appears, the macro should work.
How to make the macro understand when there is a square and when it is not?
I think js should at least be used here.
Well, or for example, when a text of this length appears .. you need to do this, and if less, then ignore it.
Unfortunately, macros do not understand this and have limited logic and work with the variable.
Maybe some software?

Answer 1

What macros? What window? And what about the mouse?