If I add `println!("{:?}", key_event)` to https://github.com/servo/servo/blob/2e715612fde5a3595807717cd1744c0430d14d69/ports/winit/browser.rs#L202, I see Down followed by Up for most keys like Return, Shift, Tab, etc. However I only ever see Down events for any letters I press.
