I'm talking about the "preview" usually at the bottom left of the browser when you hover a link. By using a Javascript event handler on the link you can override what happens.
Google does that for instance, if you hover on top of a search result it'll look like a direct like to the website, however if you look at the HTML source it looks something like this:
So even though the href goes to wikipedia in this case if I click the link the browser goes to a google page that then redirects me.
You can see the real URL by right-clicking on the link and then hovering again, it causes the "onmousedown" code to run and replace the href by the real value.
Duckduckgo uses a "click" event handler instead. As far as I can't tell Bing doesn't do anything and directly links the target website, which is odd. I may be missing something.
What!? Just tooltip, or status bar also?