The PresentationReceiver interface allows a receiving browsing context to access the controlling browsing contexts and communicate with them. The PresentationReceiver interface MUST be implemented in a receiving browsing context provided by a receiving user agent.
connectionList attribute MUST return the result of running the following steps:null, return the presentation controllers promise and abort all remaining steps.null, resolve the presentation controllers promise with the presentation controllers monitor.
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https://developer.mozilla.org/en-US/docs/Web/API/PresentationReceiver