The Presentation API is a web standard that lets a web page display its content on an external presentation device, such as a projector, TV or monitor, so web applications can run presentations without separate presentation software. It is defined by the W3C Second Screen Working Group and is aimed at developers and designers building collaborative, media-sharing or presentation features into web applications.
At its core, the API lets a controller page start a presentation session on a secondary display, discover available displays, and monitor connection state in real time as displays become available, disconnect or change. A message channel between the controller and the receiver page supports interactive presentations, for example changing slides or triggering animations from the controlling laptop or tablet, and it works with wired displays and wireless technologies including Chromecast, AirPlay, DLNA and Miracast.
The API is an experimental web technology available only in secure contexts, with support in major browsers such as Chrome and Opera on desktop and mobile. Because it is part of standard web technology there is no direct cost to use it, though developers may incur hosting or related service costs, and it is suited to educational, corporate and other settings where visual content needs to be shared with a larger audience.
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