This is very useful if you have some kind of automated equipment that constantly changes an image (or the actual contents of the page). This technique is often used with cameras that creates an image of a place at specific intervals.
Most popular browsers supports this feature, but in order to provide compatibility with other browsers it is nice to include a link to let the reader manually reload the page.
The HTML tag on this page that reloads the page looks like this:
The CONTENT attribute contains the number of seconds to wait before loading the page followed by the URL and needs to be specified in the following format:
"8; URL=Autorefresh.html".
The name of this file is Autorefresh.html. In some browsers you may need to include the full URL (http://.....) to the page.