Single page application
From Seo Wiki - Search Engine Optimization and Programming Languages
One important property of SPAs is that they can be executed from a local file using the File URI scheme, unlike normal web pages which must be served over HTTP. This gives users the ability to download the SPA from a server and run the file from a local storage device, without having to run any server software.
In order to store and update data, SPAs must be self-modifying. That is, the SPA must be capable of writing itself to disk, including a representation of the state that is to be persisted.