There is a UI element that I have seen in several places, but in trying to find an implementation for it, I realized I don't know how to correctly refer to it. The element that I am thinking of is a modified autocomplete text field, such as in Evernote's tags field on iOS or Gmails email address fields.
Here's an example:
Specifically, these appear as simple autocomplete text fields. However, when an element autocompletes, or a delimiter like a comma is typed, the element becomes an atomic 'bubble' which can no longer individually be modified, but the user can continue to enter a new autocomplete terms in the same field.
Any idea what these are kinds of fields are called?