Dexter Model

A reference model for hypertext systems published in 1988 that defines the fundamental concepts of components, links, anchors, and presentation specifications. The Dexter Model was created as a superset description of what hypertext systems could be, with individual systems like HTML implementing subsets of its capabilities. The model uses a three-layer architecture: a within-component layer (content), a storage layer (components and links), and a runtime layer (presentation and interaction). Understanding the Dexter Model is relevant to accessibility because it reveals the assumptions baked into HTML — such as unidirectional links, static content decomposition, and limited presentation specifications — that constrain what assistive technology can perceive and adapt.