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User agents act as intermediaries between a service and the end user; rather than downloading an executable program from a service that has arbitrary access into the users' system, the user agent only allows limited access to display content and run code in a sandboxed environment. End users are diverse and the ability of a few user agents to represent individual interests properly is imperfect, but this arrangement is an improvement over the alternative — the need to trust a website completely with all information on your system to browse it. RFC 8890: The Internet is for End Users, Mark Nottingham What if that, but more? Trust has been the defining constraint on the Web's evolution towards more powerful, more applicative capabilities. In a Web context, the user must be able to safely load any arbitrary URL, to safely click on any arbitrary link. The way in which this is achieved is that the runtime places strict limits on what a Web page can do, which in turn necessarily limits power

User agents act as intermediaries between a service and the end user; rather than downloading an executable program from a service that has arbitrary access into the users' system, the user agent only allows limited access to display content and run code in a sandboxed environment. End users are diverse and the ability of a few user agents to represent individual interests properly is imperfect, but this arrangement is an improvement over the alternative — the need to trust a website completely with all information on your system to browse it. RFC 8890: The Internet is for End Users , Mark Not

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