Merge pull request #199 from zw963/master

Author: Mifrill

README.md

@@ -1029,6 +1029,20 @@ browser.playback_rate # => 2000
 #### node? : `Boolean`
 #### frame_id
 #### frame
+
+Returns the [frame](https://github.com/rubycdp/ferrum#frame) object within parent node:
+
+```ruby
+div = browser.at_css("div.has-frame")
+div.at_css("iframe").frame # => Frame
+```
+
+You can keep using [Finders](https://github.com/rubycdp/ferrum#Finders) within that frame object:
+
+```ruby
+browser.at_css("div.has-frame").frame.at_css("body") # => Node
+```
+
 #### focus
 #### focusable?
 #### moving? : `Boolean`