'buffered' returns a TimeRanges object.
Test Result Test Assertion
FAIL Test passes if the text 'PASS' appears to the left and the text 'Your browser does not support media elements.' does not appear anywhere on this page.

http://www.w3.org/TR/html5/video.html#dom-media-buffered

The buffered attribute must return a new static normalized TimeRanges 
object that represents the ranges of the media resource, if any, that 
the user agent has buffered, at the time the attribute is evaluated.