WARP is a Web-based dynamic spatial hypertext that runs in a Web browser. WARP includes the ability to transclude other spatial hypertexts as collections. WARP also enables annotation and other content manipulation to be preserved in personal reading sessions. WARP uses a variety of presentation adaptations to contextualize the spatial hypertext's display. In particular WARP uses a variable number of models to guide adaptation in response to multiple relevant factors. Behaviors in WARP help preserve perceptual structures that may be lost due to adaptation and user interaction.