If using Firefox, please enable dom.presentation.controller.enabled in about:config.
Make sure you are running this at localhost or with HTTPS enabled.
The PresentationConnection Object adds properties and methods to control the current presentation session
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This is the console. It logs all messages sent by the other page.
Whenever the other page sends a message, a message event is sent to this page.
The sending page can also send data, which will be accessible via the data property of the event.