[Description] Occurs periodically during a download to provide navigation progress information. [Name] 
NavigationProgress
F r a g m e n t N a v i g a t i o n
L o a d C o m p l e t e d
N a v i g a t e d
N a v i g a t i n g
N a v i g a t i o n F a i l e d
N a v i g a t i o n P r o g r e s s
N a v i g a t i o n S t o p p e d