Selector

A selector is a CSS expression used to identify one or more elements in an HTML document. The system supports standard CSS Level 4 selectors plus extensions for matching against microdata values, numeric comparison, structure validation, and schema type inheritance (:isa()). In Sessel, selectors are first-class expressions written as literals.

Canonical home: Reading and writing — how selectors identify document fragments.

Extension reference: Selector Extensions — full reference for :contains(), :value-equals(), :isa(), and other custom pseudo-classes.