This seems to work in Chrome well, but I have this iframe displaying content from a mysql table and I want to refresh it every 10 seconds, how can I do this without the user knowing the iframe is being reloading? (No loading icon)
With Javascript, you could have two iframes which share the load. When one fully loads, it swaps its position with the other iframe so the user never sees the load.
Demo: http://jsfiddle.net/AlienWebguy/NZjL8/1/
For the demo I have it refresh every 5 seconds.