Mobile Safari - Input field submit button

I notice when you g开发者_JAVA技巧o to google.com for example, the input field keyboard has a "submit" button as opposed to the original "return" button.

How do I turn on that feature?

I tried type=search but I still see the return button.

Thanks,

Tee

It actually works.
Need to have the form tag, I initially only had the input field.