The form has been setup so that the labels support Google's 'Auto Fill' toolbar feature. This is available by using names such as FirstName, Email, and Address as the fields short field name. You can get a full list of available short field name types / names to use for Google auto fill by reviewing our product forums.
You might notice that changing the 'gift type' field from shirt to coffee mug hides the field below it for shirt size. Similar question events were presented in Demos 1-3 where fields are hidden and displayed based on specific choices made on a question.
See other Form Demos.