navigator.cookieEnabled unsupported

This property apparently isn't part of any official W3C spec, it is however supported by all major browsers and I came across a webpage which checks this property today.

Does jsdom want to strictly follow the spec, or be as browser-like as possible? I checked if there's anything where I can augment such functionality without patching jsdom, however I couldn't find anything. Is there any callback/prototype reference where I can patch the window object up before the website's js gets processed?