
PASS Test correctly reset appendWindowStart and appendWindowEnd values 
PASS Test set wrong values to appendWindowStart and appendWindowEnd. 
PASS Test set correct values to appendWindowStart and appendWindowEnd. 
PASS Test appendwindow throw error when mediasource object is not associated with a sourebuffer. 
PASS Test set appendWindowStart and appendWindowEnd when source buffer updating. 
PASS Test appendWindowStart and appendWindowEnd value after a sourceBuffer.abort(). 
PASS Test read appendWindowStart and appendWindowEnd initial values.