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Some people require more time than others to complete a task. For example, it generally takes people with physical disabilities or vision impairments more time to complete a web form than people with fast typing skills and perfect vision. Given this diversity among people, it's difficult to predict how much time to allow for a given task. However, if security concerns or other factors require a time limit to be enforced, it's important to be sure users are warned in advance before the time limit expires and offered an opportunity to extend their time.
The following are among the techniques recommended by the W3C Web Content Accessibility Guidelines 2.0:
Most Details from this page were gleaned from the University of Washington's Accessible Technology section.
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