Trying to extend protocol to native javascript DOM type with ClojureScript.

gistfile1.clj

(defprotocol PWindow
  (parent [this])
  (position [this])
  (size [this]))


(extend-protocol PWindow
  js/HTMLDivElement
  (parent [this] (.-parentNode this))
  (position [this] {:top (.-clientTop this) :left (.-clientLeft this)})
  (size [this] {:width (.-clientWidth this) :height (.-clientHeight this)}))