The Web Applications Working Group has published a Group Note of Selectors API Level 2. Selectors, which are widely used in CSS, are patterns that match against elements in a tree structure. The Selectors API specification defines methods for retrieving Element nodes from the DOM by matching against a group of selectors, and for testing if a given element matches a particular selector. It is often desirable to perform DOM operations on a specific set of elements in a document. These methods simplify the process of acquiring and testing specific elements, especially compared with the more verbose techniques defined and used in the past. Learn more about the Rich Web Client Activity.