Konqueror&#x2F;KHTML has been doing this since at least Konqueror 3.2:<p><a href="http:&#x2F;&#x2F;www.zytrax.com&#x2F;tech&#x2F;web&#x2F;browser_ids.htm#kong" rel="nofollow">http:&#x2F;&#x2F;www.zytrax.com&#x2F;tech&#x2F;web&#x2F;browser_ids.htm#kong</a>