Traits which correspond to the web platform's class interfaces.
Every HTML element is a member of one or more content categories — these categories group elements that share common characteristics. This is a loose grouping (it doesn't actually create a relationship among elements of these categories), but they help define and describe the categories' shared behavior and their associated rules, especially when you come upon their intricate details. It's also possible for elements to not be a member of any of these categories.
Element is the most general base class from which all element objects in a Document inherit.
EventTarget is a DOM interface implemented by objects that can receive events and may have listeners for them.
Trait for defining the methods related to the event handlers shared by all HTML elements.
Trait for the base class of HTML elements.
Traits for nodes in the DOM tree.
Types related to security policy.