Enumerated type used to group elements with common behavior about how they are rendered and how they relate to each other. This interface is useful to empower proper and semantic HTML writing by API design, enforcing constraints at compile time:

P {
    Span("Paragraph elements can have inline elements
          as children, like a span..."),
    Div("But not block elements, like a div!") // compilation error

no type hierarchy

Inherited Attributes
Attributes inherited from: Object
Attributes inherited from: Node
Inherited Methods
Methods inherited from: Object