CHAPTER 35. CH31 CSS SELECTORS 292
35.3 Class
In HTML markup, each tag can have a class= attribute. The attribute can
have a list of classes to which this particular tag belongs. If there is more
than one class, they must be surrounded by quote marks and separated by
spaces.
Several items can belong to the same class.
35.4 Pseudo Class
active, visited
first child, nth child, first line, first letter
35.5 Transitions
todo: as we move from field to field, we can identify the field that is currently
active by using a transition.