In addition to making Web applications easier to write, Ur/Web also makes them more secure. "Let's say you want to have a calendar widget on your Web page, and you're going to use a library that provides the calendar widget, and on the same page there's also an advertisement box that's based on code that's provided by the ad network," Chlipala says. "What you don't want is for the ad network to be able to change how the calendar works or the author of the calendar code to be able to interfere with delivering the ads." Ur/Web automatically prohibits that kind of unauthorized access between page elements.
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