This lesson describes how to hide the navigation bar, which was introduced in Android 4. Even though this lesson focuses on hiding the navigation bar, you should design your app to hide the status bar at the same time, as described in Hiding the Status Bar. Hiding the navigation and status bars while still keeping them readily accessible lets the content use the entire display space, thereby providing a more immersive user experience. This snippet hides both the navigation bar and the status bar:. On Android 4.
html - How to hide extra top and bottom of an image inside its container? - Stack Overflow
Normally, when you scroll down a webpage in Safari on your iPhone, it automatically hides the bottom toolbar and minimizes the top Smart Search field. But as soon as you scroll back up, they both reappear, which can be pretty annoying if you don't need them. Apple's iOS 13 update brings many new features to Safari , one of which solves the toolbar issue so you can keep it hidden when reading. When you lock the top and bottom toolbars in their minimized and hidden positions, it applies to the current tab you're in as well as any tabs you navigate to from it. But there are exceptions to that rule, as you'll soon see, which relates to how you disable the hiding of the toolbars. To hide the top and bottom toolbars in Safari, tap on the "AA" in the top left to open the Website View menu.