Webkit have lots of experimental CSS properties that you can currently use on your website, one of the properties we are looking at now is the text-security property. This CSS property allows you to change the the shape of the letter that are displayed in text input boxes. When the visitor types in a input password text box all the characters they type are converted into shapes to hide the password. But if you don't want to use a password input type then you have to use a text box but then people can see what your typing in. This is where the -webkit-text-security property comes in you are able to style your textbox to be just like a password input type.
This property currently only exists in webkit browsers so you will only be able to see this in Chrome and Safari browsers.