1.2.1 Normative References

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[CSS-Level2-2009] World Wide Web Consortium, "Cascading Style Sheets Level 2 Revision 1 (CSS 2.1) Specification", W3C Candidate Recommendation 08 September 2009, http://www.w3.org/TR/2009/CR-CSS2-20090908/

[CSS3Color:2011] Çelik, T., Ed., Lilley, C., Ed., Pemberton, S., et al., "CSS Color Module Level 3", W3C Recommendation, June 2011, https://www.w3.org/TR/2011/REC-css3-color-20110607/

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