Abstract: A hypertext browser displays hypertext pages and indicates draggable elements on the page being viewed. The browser also displays drop targets and detects when a user selects a draggable element and drops the draggable element within a drop target. The browser and/or the server to which it is connected examine a class relation matrix having entries for intersections of draggable element references and drop target references in which a matrix entry at an intersection of the draggable element and drop target is identified and used for performing an action which is a function of the matrix entry.