Here is a 1-paragraph summary of the text: Daily, a platform for developers to build flexible WebRTC video call functionality into their applications, has introduced a new feature called "custom buttons" that allows developers to add custom controls within the Daily Prebuilt call frame itself. This feature enables developers to extend their Daily-powered video application with custom functionality without having to use an external menu or separate UI flow. The new custom button API supports conditional use cases and can be used to create a seamless user experience, as demonstrated by converting an Electron virtual backgrounds demo to use a seamlessly integrated button in the Prebuilt call frame itself.