When a timed response is required, the user shall be alerted and given sufficient opportunity to indicate more time is required.
If the time-out occurs on the server, the server should send a message to the user indicating the process will time out. Otherwise, use JavaScript to generate a pop-up or dialog to inform the user of the time-out and allow them to request additional time.
Some users have difficulty reading or responding to information if it is displayed briefly or requires quick response time. Some Web pages are designed to time-out for security reasons. Some response delays may also be caused by the use of assistive technology used to read the page. The user should be notified that the process is about to time out and be given the opportunity to indicate if additional time is required.
View WAI Checkpoint 7.4 - Until user agents provide the ability to stop the refresh, do not create periodically auto-refreshing pages.