A window whose background is a translucent material, set with Window.setVisualEffect — the deno desktop counterpart of flutter_visual_effect_example.

• One chip per VisualEffect; the ones Window.isVisualEffectSupported rules out here are greyed out.
• The material only shows where the page paints nothing, so the window's webview is created transparent (transparent: true, a creation-only BrowserWindow option) and the page paints only its panel while an effect is on.
• The material runs to the top edge: setContentUnderTitleBar(true).
• Show backdrop puts a plain red window behind this one (a nativeapi Window, made its parent), which shows which materials blur what is behind the window.

Creation-only options do not apply to the window deno desktop opens at startup, so the example opens its own window and closes the startup one (desktop.ts).

• The window is transparent, and macOS may let clicks fall through it to whatever is behind (see deno_shaped_window_example); not checked with a real mouse yet.

npm install     # at the repository root: builds the nativeapi addon
cd examples/deno_visual_effect_example
deno task dev

Requires Deno 2.9+ (deno desktop). macOS is the platform this was checked on.