On page level we can test if every panel is visible and if the communication between them is handled properly.

Air Canada continues to be an industry leader in offering customers mobile and wireless services that provide real-time information and convenient functions for people who are on the move.

But there is no information on the 64 giant pandas in Wolong base because of communication and transport disruptions.

The Internet offers fingertip access to economic goods, a medium for political voice, and instant interpersonal communication.

However, Qu hasn't been heard from for at least 2 days because communication channels have collapsed.