1.2.1 Normative References

[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997, http://www.rfc-editor.org/rfc/rfc2119.txt

[W3C-CSS3-Namespaces] World Wide Web Consortium, "CSS Namespaces Module", W3C Candidate Recommendation 23 May 2008, http://www.w3.org/TR/2008/CR-css3-namespace-20080523/