This document specifies the design goals and requirements for a specification that would give developers a standardized way to author, package, and deploy client-side Web applications. The type of Web applications that are addressed by this document are usually small client-side applications for displaying and updating remote data, packaged in a way to allow a single download and installation on a client machine. The application may execute outside of the typical Web browser interface. Examples include clocks, stock tickers, news casters, games and weather forecasters. Some existing industry solutions go by the names "widgets", "gadgets" or "modules".