Are systems like S UPPLE practical? The most important limitation to the practical deployment of systems like Supple is the current software engineering practice, which makes the user interface code inseparable from the application logic. HTML-based web applications are still an exception. It is therefore our intention to deploy our technology first in the web context, most likely as a JavaScript library that can be included with existing pages and applications to enable a rich set of client-side adaptations and customizations.