Update build-a-sample-app.mdx (#3423)

Jan-V2 · Madoshakalaka · web-flow · commit 9ebbf99f868c · 2025-12-18T14:22:33.000+09:00
* docs: update getting started guide to document both with_props and with_root

Clarify that:
- with_props() is used to set dynamic properties for the App component
- with_root() is used to mount the app to a specific element instead of &lt;body&gt;

---------

Co-authored-by: Matt "Siyuan" Yan &lt;mattsy1999@gmail.com&gt;
diff --git a/website/docs/getting-started/build-a-sample-app.mdx b/website/docs/getting-started/build-a-sample-app.mdx
@@ -93,8 +93,9 @@ that updates its value when clicked. Replace the contents of `src/main.rs` with
 
 :::note
 The call to `yew::Renderer::<App>::new().render()` inside the `main` function starts your application and mounts
-it to the page's `<body>` tag. If you would like to start your application with any dynamic
-properties, you can instead use `yew::Renderer::<App>::with_props(..).render()`.
+it to the page's `<body>` tag.
+If you would like to start your application with any dynamic properties, you can instead use `yew::Renderer::<App>::with_props(..).render()`.
+If you would like to mount your application to a specific element rather than the `<body>` tag, use `yew::Renderer::<App>::with_root(element).render()` where `element` is a `web_sys::Element`.
 :::
 
 ```rust ,no_run, title=main.rs
