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<td width="20%">[[JavaScript Arrays|Previous]]<td align="center">[[JavaScript Essentials|Table of Contents]]<td width="20%" align="right">[[Building Forms with JavaScript|Next]]</td>
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In programming it is often necessary to wait a period of time before performing a task, or to set up an activity to repeat at predefined intervals. To address this need JavaScript provides what is known as ''Timeout'' support in the Window object. This functionality essentially allows the JavaScript developer to specify in a script that a particular function, or piece of in-line JavaScript should be executed after a specified number of milliseconds have elapsed.