Accessibility compliance is provided within advanced componentry, such as
a browser in which an on-demand editor can be launched. A toolkit of
functionality that is executable on a server is preferably provided, from
which selections can be made to configure an instance of a client editor
or similar client-side viewer. Techniques are disclosed that enable
flexible specification of the controls to be added to the viewer
instance, as well as specification of details for configuring the
controls.