Oh! I see.
Actually I have seen some news/blog sites automatically refresh after 15 minutes or so. (example1, example2) They do it because they’re posting news/breaking news, every now and then. It didn’t made sense to me. The page gets refreshed even when there are no new news posted. That’s a waste of bandwidth and a refreshing page is not good for reading.
That’s why I wondered if I could make the page only refresh when there is new news, then it would make more sense. Because, let’s imagine, if the user asked, why did you refresh? Then my site could say, because I had an update.
I guess now I’ll have to do it the conventional way, by adding:
<meta http-equiv="refresh" content="900">
in my <head> tag.
