webview2_com_sys::Windows::Win32::UI::WindowsAndMessaging

Function SetLayeredWindowAttributes

Source 
pub unsafe fn SetLayeredWindowAttributes<'a>(
    hwnd: impl IntoParam<'a, HWND>,
    crkey: u32,
    balpha: u8,
    dwflags: LAYERED_WINDOW_ATTRIBUTES_FLAGS,
) -> BOOL