No. It's also not just a "library", but a "framework". It is much more comprehensive than a typical JS library like jQuery or Prototype. qooxdoo's main focus is on creating full-featured rich internet applications (RIAs), so it comes with a large set of high-quality widgets and features a powerful, platform-independent tool chain. But due to some recent advancements it is now also possible to leverage qooxdoo as a low-level library for extending traditional HTML documents.