The Progress Bar is one of the latest components to be added to the excellent library of UI widgets and interaction helpers built on top of jQuery. It was introduced in the latest version of the library, which at the time of writing is 1.7.

The progress bar is currently only determinate, which means when we update it, we have to tell it explicitly what its value is, and we must know beforehand when the process it is used to measure completes. This widget is not currently the best choice for a process which will take an indeterminate length of time to complete.
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