Rolling out Sly - The JavaScript Selector Engine

Sly is a turbocharged, cross-browser, library-agnostic JavaScript class for querying DOM documents using CSS3 selectors.

Sly awesomeness:

• Pure and powerful JavaScript matching algorithm for fast and accurate queries
• Extra optimizations for frequently used selectors and latest browser features
• Works uniformly in DOM documents, fragments or XML documents
• Utility methods for matching and filtering of elements
• Standalone selector parser to produce JavaScript Object representations
• Customizable pseudo-classes, attribute operators and combinators
• Just 3 kB! (minified and gzipped, 8 kB without gzip)
• No dependencies on third-party JS libraries, but developers can override internal methods (like getAttribute) for seamless integration.
• Code follows the MooTools philosophy, respecting strict standards, throwing no warnings and using meaningful variable names

Querying the DOM with Sly:

// Finds all odd rows in all tables
var rows = Sly.search('table td:odd');

// Finds all links with class "internal" and an attribute "href" starting with "#".
var links = Sly.search('a.internal[href^="#"]');

// Another notation is also possible, since Sly acts as a constructor
var snippets = Sly('pre.highlight.javascript > code').search();

// features is just one element, lists has all list items are siblings of features
var features = Sly.find('#features');
var lists = Sly.search('~ ul', body);

http://digitarald.de/journal/89737433/rolling-out-sly-the-javascript-selector-engine/