Mutable Web is a customization layer built on top of the existing web:
Mutations are customized versions of the original websites, enhanced with sets of applications (dapplets).
Communities control and manage mutations, which are used by their members as default versions instead the original ones.
Mutable Web Engine
It uses Adapters to parse and expose the live semantic structure of legacy webpages on the fly.
The Mutable Web Engine attaches dapplets to the elements of the semantic structure and executes them.