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The book flipped to a page titled showing the messenger's journey:
"I'm JavaScript," the character chirped. "I'm the logic of the browser. I can make things move, validate forms, and create pop-ups. But if you want to talk to the server without that annoying page blink, you need my friend, ."
A second character, a swift-moving messenger with a backpack labeled , zipped into view.
The server starts handing over the data.