One of the new types of inputs in HTML5 is
(<input type=search name=s>. It does absolutely nothing in most browsers. It just behaves like a text input. This isn’t a problem. The spec doesn’t require it to do anything special. WebKit browsers do treat it a bit differently though, primarily with styling.
css-tricks is haring tutorial how to styling “WebKit HTML5 Search Inputs“. The result is fancy search box that work on webkit browser.