MotivationSome websites embed code in iframes, and pass user data between them. The use of these sites has thus far been limited to teenagers and others who are comfortable with some aspects of their lives being very public. The same development model -- where one company provides a general storage layer for data, and third parties provide custom interfaces and extensions - has not been extended to systems that deal with valuable data. This development model is promising, though. Large software companies have to target their user-interface efforts at a mythical average user; the high costs of researching and understanding the needs of niches of users means that user interfaces tend to suffer from the "lowest common denominator" effect. But there are many developers who understand niche markets, and know how to write custom user interfaces and workflows. If we can safely embed third-party user interfaces and workflows into generic backends, we can encourage a market for embedded applications that will make the web experience much richer. Caja aims to allow that safe embedding.
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