Re: Is it ever possible for an asynchronous service method's callback to get called without yielding to the browser's event loop?

GWT-RPC makes use of RequestBuilder, which is based on XMLHttpRequest. XMLHttpRequest (XHR) uses events to communicate back with the code, so anything happening on an XHR results in an event being pushed on the event queue, and dequeued by the event loop.

Does that answer your question?

More details of how browsers behave (or should/will behave in the near future) can be found in the HTML5 spec http://www.whatwg.org/html5 or http://www.w3.org/TR/html5

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