Support for createRange?

[Zac Morris]

I'm accessing a URL that is throwing a JavaScript error when I access via Zombie:

{ [TypeError: Object [ null#ext-gen2 ] has no method 'createRange'] filename: undefined }

When I investigated further I found a test, that I ran via 

browser.evalute('document.implementation.hasFeature("Range", "2.0");');

...which returns "false" in Zombie.

So my question is this: Is that a missing feature of Zombie, or of Node.js?

Still new to all of this...

THANKS!