ASCII art is not scalable when you mix it with text like on this site since scaling the art will also make the text unreadably small. Screen readers depends on

ASCII art is not scalable when you mix it with text like on this site since scaling the art will also make the text unreadably small. Screen readers depends on the semantics as defined in HTML to recognize what to read. In this case when you use text to define the 'layout' of the page, screen readers loses the ability to differentiate between content and presentation. This is also one of the reasons why using tables for layout is a bad idea.