CSS 2.1 became a Candidate Recommendation on February 25, 2004, but CSS 2.1 was pulled back to Working Draft status on June 13, 2005, and only returned to Candidate Recommendation status on July 19, 2007.
CSS 2.1 стана препорака за кандидат на 25 Февруари, 2004, но CSS 2.1 беше вратен на работната група на 13 Јуни, 2005 and only returned to Candidate Recommendation status on July 19, 2007.