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versioned_docs/version-0.0.9/h_extensions/index.md

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+---
+title: Extensions
+slug: /extensions
+---
+
+OSUI Extensions are a practical way to extend the possibilities with OSUI, Extensions allow for there to be a specific use or functionality that may otherwise be bloat or the opposite behavior of the use case.
+
+### `screen.extension(&mut self, ext: Extension)`
+
+You likely noticed that we used this function in the [Hello World App With Velocity](/docs/next/#hello-world-app-with-velocity) example, this function simply allows for structures implementing [Extension](/docs/next/extensions#trait-extension) to be included in the program.
+
+---
+
+## `Handler<E: Event>`
+
+A `Handler` is a `Component` that is called when a specific event is dispatched, typically through a `Extension`.
+
+### 📦 Usage
+
+```rust
+rsx!{
+    @Handler::new(|widget, t: &TickEvent| {}
+    "Hello World"
+}
+```
+
+---
+
+## Trait `Extension`
+
+### `init(&mut self, _screen: Arc<Screen>)`
+
+Runs right after the Transform component is applied to every widget.
+
+### `render(&mut self, _scope: &mut RenderScope, _widget: &Arc<Widget>)`
+
+Runs right before the `Element::render` is called.