The present invention provides a comprehensive development platform and client-side technology for intelligent and cost-effective delivery of video, audio and broadband content over a network, such as the Internet, to desktop, mobile computing, and network connected devices. In one embodiment of the present invention, a content development environment provides a single tool for developing unified online and offline content. With the content development tool, the user interface of the offline content has a substantially similar appearance and behavior to the user interface presented by the online content. As such, the user interface for the both the online and offline content may be generated from a single user interface design. The content development tool generates and publishes a set of online content files and a set of offline content files from the single design. In some embodiments, the offline content is published to a web-site of a content provider as a download package to be automatically downloaded for local use by a client using other techniques of the present invention. In some cases, the content development tool automatically creates and configures a mechanism in the online content to download the corresponding and substantially similar offline content to the client. As such, a content provider may use a single development tool to create a consistent and desired user experience, including branding and interactive content, for both online and offline content.