Action items are an optional link in the header, which enables the site to provide a very short action link. This should not be used as additional navigation; it should only be used for unique action items. For example, this could be 'APPLY' or 'CART'. An action item should be a single word, or two short words if you only have one action item. You may only have one or two action items. Remember that this space is limited and these should not be wide items.
The action items are not their own component, but can be viewed as an option on the Header demo.