You can pick your favorite framework (Vue, Angular, Ember) or templating engine (React, Preact, hyperHTML, µhtml).
Merkur widgets work with a multi-page application built with jQuery or a single-page application, as well as an isomorphic application.
Website load time is a critical usability factor for your users. Merkur speeds up loading by including server-side rendering out of the box.
All base functionality is defined as plugins, and adding your own is a matter of creating a single file.
You have control over Babel, Webpack, server, etc.
Merkur is less than 1 KB minified + gzipped.