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In certain edge cases, XMLHTTPRequest is impossible or unpalatable. It could be cross-domain security issues. It could also be that you’ve got a friendly script on the other end that supplies a JSON object with a callback, so you don’t need to take the extra step of proxying it through a server on your domain.Dynodes use CSS, unobtrusive Javascript, and the Document Object Model to create, import, run, and destroy foreign script nodes on demand, without the usual security restrictions faced by AJAX.

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