The above command and this
<<>link href="slide/page3.html" rel="next">
which will pre-load the next page are the two commands the basically control the timing and loading of the next page of a slide show. Notice the relative URL destination is the same for both commands.
This tute works with this one.
To test this programming feature you may click here and after the wav has loaded and played you will be transported to the programmed site.
BTW the punctuation mark after the number 10 above is a semi-colon not a colon. The number 10 may be changed to any number represented in seconds.