First tab is active by default:

$('#example').tabs();

However, if you click on the tab title, you'll go to jQuery documentation.

That's because the link is in a custom class called clickable-tab.

This tab is not in class "clickable-tab" and has the default jQuery bahaviour".

Lorem ipsum dolor sit amet, consectetuer adipiscing elit.

This tab is different, it is in class clickable-tab. If you click on the title, you'll go back to my blog.