CSS - Addessing model (through selector and properties)
About
CSS addressing model.
Selectors and properties allow style sheets to refer to the following parts of a document or user agent:
- Elements in the document tree and certain relationships between them (???)
- Attributes of elements in the document tree, and values of those attributes (attribute selectors).
- Some parts of element content (see the :first-line and :first-letter pseudo-elements).
- Elements of the document tree when they are in a certain state. See Selector - Pseudo Class
- Some aspects of the canvas where the document will be rendered.
- Some system information (see the section on user interface).