Default: page inside the safe area
On iOS autoAdjustSafeAreaInsets is on, so the WebView starts below the status bar, notch or Dynamic Island. The bar takes statusBarBackgroundColor and statusBarTextColor (white or black), with darkModeStatusBarBackgroundColor and darkModeStatusBarTextColor for dark mode. On Android the color comes from colorPrimaryDark in style.xml and the text from blackStatusBarText.