I may have missed something on the imedix.com example but it works because it is not doing any Ajax stuff with the tabs. The only Ajax stuff seems to be to reload the tab images and data. When you click on a tab it reloads the entire page, which is why the URL is correct in the address bar (btw I traced all this using wireshark).

The tab example seems complicated with Hijax. Taking the progressive enhancement approach

i. The baseline code would have different versions of the page for each tab.
ii. You could use CSS/DOM to have a single page with different content shown depending on the tab that is clicked. From an SEO perspective you would have one big page will all the content in something like individual list elements. However this would not be possibly to hijaxify.

You would have to return to i) and rather than load the entire page reload just the tab data but I’m not sure this is possible either with the hijax approach.

In short it seems like you would have to do this at the server side. Either server a CSS/DOM version of the page if the browser doesn’t support JS or an Ajax version of the page.

I’d be interested in comments though.