I want to hide the status bar / statusbar on iOS and/or Android (instead, I want an full screen / full-screen / fullscreen app) / want to have a transparent status bar

Hiding the status bar (or changing the background to transparent)  is not that good in terms of Apple/Google GUI guidelines in combination with web content, so it’s not the default option in WebViewGold and would require some further modification. The best choice would be to use the included WebViewGold features for styling the background and text color of the status bar (e.g., the same color as the web app header).