document deps

docs/mithril.deps.md

@@ -7,11 +7,9 @@
 
 ---
 
-This is a testing method to set the `window` object in an environment that does not have it (such as the server).
-It will normally _not_ be used in an application, as `window` is already available to Mithril.
-For normal (client-side) use of mithril, this method will not be used.
+This function overwrites the reference to the `window` object that is used internally by Mithril. It is useful for injecting a mock `window` dependency for the purposes of testing and for running Mithril in non-browser environments. The mock object used by Mithril for its own test suite [can be found in the development repo](https://github.com/lhorie/mithril.js/blob/next/tests/mock.js).
 
-It is used in Mithril's testing suite, and can be used to supply a mock `window` for browserless testing.
+By default, Mithril uses `window` itself as the dependency. Note that Mithril only uses the mock object for browser APIs such as the DOM API and `requestAnimationFrame`, but relies on the environment for ECMAScript features like `Object.keys`.
 
 ---
 
@@ -42,14 +40,14 @@ where:
 
 -	**Object Window**
 
-	This should be a mock of the `window` object.
+	This should be either `window` or a mock of the `window` object.
 
 	Mithril uses certain `window` methods that will need to be made available for complete test coverage, depending on your application:
 
 	- `window.document`
-	 - Mithril also uses certain methods on the DOM node object
+	- Mithril also uses certain methods on the DOM node object
 	- `window.requestAnimationFrame`/`window.cancelAnimationFrame`
-	 - Falls back to `window.setTimeout`/`window.clearTimeout`
+	- Falls back to `window.setTimeout`/`window.clearTimeout`
 	- `window.location`
 	- `window.history`
 	- `window.scrollTo`
@@ -57,5 +55,5 @@ where:
 
 -	**returns** Window
 
-	The returned window is the same as that passed in.
+	The returned window is the same as what is passed in.