A toggle is a switch that can be set to two opposing positions, such as on or off. It can also be used to control the visibility of content or a view. Toggles are often implemented as part of responsive designs in web development to control the display of certain content based on screen size or device type.

Toggles are often implemented as part of progressive enhancement in web development to allow developers to deliver new features to their users at a pace that feels comfortable for them. This allows developers to gather feedback and make necessary adjustments before rolling out a feature fully. Facebook is well known for its use of Feature Toggles to test changes and improvements in a controlled environment.

When implementing toggles in a user interface it is important to make sure that the toggle can be easily understood. This includes making sure that the current state of the toggle is obvious through clear visual feedback. This can be achieved through the use of icons, color changes or labeling. It is also important to make sure that the toggle can be reliably triggered and responds appropriately to user input. This is typically accomplished through the use of a simple button.

Savvy teams view the Feature Toggle configurations in their code as inventory that comes with a carrying cost and strive to keep the amount of idle toggles low. To achieve this they are proactive in removing toggles that have reached the end of their lifecycle by adding a toggle removal task to their backlog or incorporating a process into their management platform.