WARNING: this fork is based on legacy jsdom version ~0.10.5.

UPDATE: jsdom 4+ doesn't depend on contextify anymore however it no longer works with Node.js™ and instead requires io.js.

jsdom-little

Lightweight cut down version of jsdom.

Removed dependencies:

Running JavaScript code in browser context
Fetching or processing external resources
Window
Events
XmlHttpRequest
Content of <style> nodes is not evaluated
jsdom.env works only as jsdom.env(html, level, callback) and returns {document: document}

You need something from jsdom (DOM, parsing, etc.) but full browser emulation is overkill.