//! The reference app, `src/main.rs`, in a browser: the same `DemoApp` the
 //! Wayland shell runs, run on a canvas by `cce_ui::web::run`. Built for
 //! wasm32 as a cdylib and bound with wasm-bindgen; a page calls
 //! `start(canvas, fonts, families, fill)` — `fonts` each a font file's bytes,
 //! `families` the generic serif / sans-serif / monospace families as
 //! "serif,sans,mono" (empty for the defaults; any part may be empty), `fill`
 //! true to let the page size the canvas (`Sizing::Page`) rather than the app
 //! (`Sizing::App`) — and `capture()` for the next frame's pixels.
 //! `scripts/web-probe/demo` serves it and drives it.
 //!
 //! On a native target this example is empty.
 
 #[cfg(target_arch = "wasm32")]
 #[allow(dead_code)]
 #[path = "../src/main.rs"]
 mod demo;
 
 #[cfg(target_arch = "wasm32")]
 mod web {
     use cce_ui::web::{Fonts, Sizing};
     use wasm_bindgen::prelude::*;
 
     #[wasm_bindgen]
     pub async fn start(canvas: web_sys::HtmlCanvasElement, fonts: js_sys::Array, families: String, fill: bool) -> Result<(), JsValue> {
         std::panic::set_hook(Box::new(|info| web_sys::console::error_1(&info.to_string().into())));
         let mut fonts = Fonts::new(fonts.iter().map(|f| js_sys::Uint8Array::new(&f).to_vec()).collect());
         let mut names = families.split(',').map(|f| Some(f.trim()).filter(|f| !f.is_empty()).map(String::from));
         fonts.serif = names.next().flatten();
         fonts.sans_serif = names.next().flatten();
         fonts.monospace = names.next().flatten();
         let sizing = if fill { Sizing::Page } else { Sizing::App };
         cce_ui::web::run::<super::demo::DemoApp>(canvas, fonts, sizing).await
     }
 
     /// The next frame, read back from the GPU as RGBA8 (`cce_ui::web::capture`).
     #[wasm_bindgen]
     pub async fn capture() -> Result<js_sys::Uint8Array, JsValue> {
         let frame = cce_ui::web::capture().await?;
         Ok(js_sys::Uint8Array::from(&frame.rgba[..]))
     }
 }