From the standpoint of the developer using Dioxus, you don't ever need to write any Javascript. You only need to write Rust code with rsx macros for the view layouts, similar to React or Swift UI. However, if your question is about the internals of the Dioxus framework, and whether it directly interacts with the DOM without any Javascript, then I am not really sure. I imagine they use either no javascript at all, or a thin layer of javascript to serve as a bridge between WASM code and the browser DOM API.