For example, in the search tool if you change the selection, the contextual content tab blinks (there is also a strange effect with the CMS title that quickly move between the center and the left of the ribbon but this might be a side effect).
Another example with the content attachments tool. When a file is selected in the tool there is 2 contextual tabs. When changing the selection in the tool the first contextual tab blink, but not the second.