The Web Applications Working Group invites implementation of the Candidate Recommendation of DOM Parsing and Serialization. This specification defines various APIs for programmatic access to HTML and generic XML parsers by web applications for use in parsing and serializing DOM nodes.
The group also published a Working Draft of Shadow DOM. This specification describes a method of combining multiple DOM trees into one hierarchy and how these trees interact with each other within a document, thus enabling better composition of the DOM.
Learn more about the Rich Web Client Activity.