Selectors Level 3

Tantek Çelik, Elika J. Etemad, Daniel Glazman, Ian Hickson, Peter Linss, John Williams

Citation
Tantek Çelik, Elika J. Etemad, Daniel Glazman, Ian Hickson, Peter Linss, John Williams, Selectors Level 3, World Wide Web Consortium, Proposed Recommendation PR-css3-selectors-20091215, December 2009.
Descriptions
Abstract:

Selectors are patterns that match against elements in a tree, and as such form one of several technologies that can be used to select nodes in an XML document. Selectors have been optimized for use with HTML and XML, and are designed to be usable in performance-critical code. CSS (Cascading Style Sheets) is a language for describing the rendering of HTML and XML documents on screen, on paper, in speech, etc. CSS uses Selectors for binding style properties to elements in the document. This document describes the selectors that already exist in CSS1 and CSS2, and further introduces new selectors for CSS3 and other languages that may need them. Selectors define the following function: expression * element -> boolean. That is, given an element and a selector, this specification defines whether that element matches the selector. These expressions can also be used, for instance, to select a set of elements, or a single element from a set of elements, by evaluating the expression across all the elements in a subtree. STTS (Simple Tree Transformation Sheets), a language for transforming XML trees, uses this mechanism.

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