In an example embodiment, a container is downloaded, the container being an application natively executable by a first operating system of the user device, the container including: a container service including one or more libraries of functions designed by a container designer to natively operate on the first operating system; a browser; container metadata defining functions of the application, the functions compatible with the container service for the first operating system and also compatible with a container service for a second operating system; and a plug-in including one or more additional libraries of functions designed by an entity other than the container designer to perform additional native operations on the first operating system. Then, the container metadata can be executed using the browser, causing function calls to the container service and plug-in and thus controlling native functions of the user device.