Navigation Axis

A navigation axis is a concept from screen reader research describing a specific linear serialization of a subset of web page elements that represents one navigation strategy. Rather than forcing blind users through a single reading order (the DOM order), a multi-axial navigation model provides several axes — such as an article axis, a menu axis, a heading axis, or a sidebar axis — each offering a different way to traverse the page. Users can switch between axes at intersection points where elements belong to multiple axes, dynamically changing their navigation strategy. The concept, introduced in the ABBA framework, draws an analogy to a transit system: axes are like train lines, intersections are stations, and users take "express" axes for overview navigation and "local" axes for detailed reading. This approach addresses the fundamental limitation of sequential screen reader navigation by providing the kind of multi-strategy browsing that sighted users naturally employ.