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The Wikipedia app for Office has an iFrame loaded as part of the sandbox.html page. The sandbox.html page and its scripts are hosted in a sandbox domain, which is isolated from the app domain where the file Wikipedia_dev.html is hosted. The app domain is the place that the local Internet Information Services (IIS) Express starts. The sandbox.html and sandbox.js are loaded during run time when the app is started.
The Wikipedia app for Office is an open-source project. You can download the source code from the Wikipedia App for Office page on CodePlex.