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A page or window, usually smaller than the regular window, that pops up either when a link or linked item is clicked, or by some automatic stimulus. Pop-ups are most useful in presenting photo enlargements when clicking a thumbnail photo. They are also used to display announcements or advertisements, usually unrequested by the viewer. A pop-up can be made to close with a button or link word or using an embedded javascript that will make the pop-up close automatically after a set number of seconds or minutes. A pop-up is essentially the same as any other browser page except that it is much smaller and has no web browser tool panels.

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