External Display API
The External Display API is a web platform interface that allows web applications to detect and control external displays, such as monitors, projectors, or TVs, enabling features like multi-screen presentations, extended desktops, or media playback on secondary screens. It provides methods to enumerate available displays, request permission to use them, and manage content presentation across multiple screens. This API is part of the broader Web Platform APIs designed to enhance web app capabilities for professional and entertainment use cases.
Developers should learn the External Display API when building web applications that require multi-screen functionality, such as presentation tools, digital signage systems, video conferencing apps, or gaming applications that benefit from extended displays. It is particularly useful in scenarios where users need to mirror or extend content to external monitors, enabling richer user experiences in business, education, and entertainment contexts without relying on native applications.