xodus transforms HTML as it leaves the server and travels to the promised land of the end user's browser.
xodus accomplishes this by providing helper classes that build on CloudFlare's HTMLRewriter.
Hopefully native browser service workers will support something similar eventually, which would allow weaving in data held in local storage, for example.
Its syntax is specific (but extendable) for components that use the may-it-be family of element behaviors/decorators to achieve binding, beginning with be-definitive.
Name inspired by this funny comment.
Usefulness of this project should grow if, W3C willing, something like templ-mount is built into the platform.