Blazor hosting

Sway hosts the standard Blazor component model, but it is not a Blazor Server or WebAssembly host, so some framework features that depend on a browser or a JS runtime aren't available.

Limit	Notes
No JS interop	IJSRuntime is not registered. Components that inject it fail. This rules out Virtualize, InputFile, FocusAsync, and most third-party component libraries.
No routing	@page is ignored; Router and NavigationManager are not provided. Switch views by swapping components based on state, as the sample app's menu does.
ElementReference	@ref on elements is ignored (reference-capture frames are skipped).
Markup frames	Static HTML emitted by the Razor compiler is parsed by a minimal fragment parser: no implicit tag closing, no table fix-up, entities via HtmlDecode only.
EditForm and validation components	Untested. The submit event path works for a plain <form @onsubmit>.
Hot reload	Untested.
Service provider	Only logging is registered. Add services by extending UiHost.

Everything else — data binding, event handlers, cascading parameters, dependency injection you register yourself, component lifecycle methods — works the same as it does in any other Blazor host, because it's the same Microsoft.AspNetCore.Components render tree underneath.