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//! Runtime identity of the host operating system and application target.
//!
//! Host conventions are independent of the backend delivering the application:
//! a browser on macOS follows Mac keyboard conventions without native Mac APIs.
//! Backends provide this identity; consumers read it through the application.
/// The host operating system and the kind of application delivering the UI.
/// The host operating system, including when the application runs in a browser.
/// The kind of application delivering the UI, independently of its host OS.