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Showing content from https://github.com/w3c/presentation-api/issues/391 below:

Steps that re-use objects should specify the relevant settings object/Javascript Realm · Issue #391 · w3c/presentation-api · GitHub

There are three algorithms that re-use objects:

• getAvailability re-uses a Promise and a PresentationAvailability
• reconnect re-uses a PresentationConnection
• navigator.presentation.receiver.connectionList re-uses a Promise and PresentationConnectionList

These steps need to specify the relevant settings object / Realm, instead of the current settings object/realm. Otherwise, badness ensues when they are invoked or accessed across browsing contexts. See [1] for an example of this with navigator.getBattery().

[1] https://www.w3.org/TR/html52/webappapis.html#realms-settings-objects-global-objects

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