libcef is the Chromium embedded framework[0], so your build isn't using a webview or maybe its using both. I just tried it on my mac, and I can't keep libcef out even with `--backend webview`.

https://github.com/chromiumembedded/cef

IIRC Electron hello world is ~ 100-150 MB because it bundles a browser/Chromium runtime.

So I hoped we could have a <= 20 MB solution by reusing the OS webview or similar. Having more than 400 MB is a bit deceptive for me. (Again: maybe I just did something wrong in the config: should I do something else than `deno desktop test.ts`?)

Try the webview backend: `deno desktop --backend webview`