Macro web_main 

macro_rules! web_main {
    ($app:path) => { ... };
    ($builder:expr, $app:path) => { ... };
}

Declares the browser entry point for an application’s wasm module.

A page has no library loader and no main of its own to run: the Renderer’s module owns the loop and calls this once both wasm modules exist, and it answers with the address of the block the Host lends the Renderer.

The export is here rather than in this crate because a wasm module cannot be linked with an undefined symbol the way an ELF shared library can. Android’s cdylib imports dioxus_compose_android_main from the application and the dynamic linker resolves it at load time; a browser refuses to instantiate a module whose imports are not all supplied, so the entry point is defined where the root component is.

compose_rust::web_main!(app);