The CSS Working Group is a working group created by the World Wide Web Consortium (W3C) in 1997 to tackle issues that have not been addressed with CSS level 1. The number of members reaches 125 in April 2017. 
The working group is co-chaired by Rossen Atanassov and Alan Stearns .
The first CSS test suit (CSS1) was created by Eric A. Meyer , Hakon Wium Lie and Tim Boland along with other contributors.  In early 1996 Lie cooperated with Bert Bos , who was already developing a new browser called SPP, and produced CSS standard. They presented their achievements in 1994 and in 1996 at the “Mosaic and the Web” conferences in Chicago. W3C has been established by that time and is working on their attention. [ quote needed ]
- “CSS level 1 finally emerged as a W3C Recommendation in December 1996.” 
- The same group working on CSS was also developing HTML and DON. This group, HTML Editorial Review Board, in 1997 was divided according to the three different programs. [ quote needed ]
- Chris Lilley managed the CSS working group, which in February 1997 started working inside W3C, deal with the issues uncovered by the CSS1. 
- In late 1998 the CSS level 2 was released, while it was revised in 1999. 
- By 1999 there are 15 members working in “Cascading Style Sheets and Formatting Properties Working Group.” 
- The construction of the third level of CSS started in 1999, but until 2006 it faced serious limitations. [ quote needed ]
- In 2005, the CSS Working Group decided that already published standards (CSS 2.1, CSS3 text etc.) should be re-examined and updated. [ quote needed ]
Benefits for members
CSS working group members belong to W3C. This membership offers to them four important benefits; interaction, strategy, participation and leadership. The first characteristic provided, can be explained to the leading companies, organizations and individuals specialized in web technologies. “W3C Activity proposals” are strategically reviewed and operated by the members, giving them the ability to work methodically. Participating in the CSS working group allows members to change / shape technologies influencing businesses as well as consumers. Finally, CSS members are adopting a significant role in the W3C project of developing the Web standards, which requires leadership skills and dedication. 
Members of the CSS Working Group include representatives from the following organizations:
- Adobe Systems Inc.
- Google , Inc.
- Opera Software
W3C has also invited a few experts to collaborate with the working group:
- Elika Etemad
- Koji Ishii
- Dael Jackson
- Molly Holzschlag
- Brad Kemper
- Jirka Kosek
- Anton Prowse
- Florian Rivoal
- Lea Verou
There are a few W3C staff members also participating in the group:
- Bert Bos
- Richard Ishida
- Philippe Le Hégaret
- Chris Lilley
- Liam Quin
- Doug Schepers
Active editors of CSS Specifications include the following:
- Rossen Atanassov
- Tab Atkins Jr.
- David Baron (computer scientist)
- Bert Bos
- Tantek Çelik
- John Daggett
- Elika Etemad
- Simon Fraser
- Aryeh Gregor
Membership fees over the years
The multiplier depends on the World Bank classification of country income (low, lower middle, upper middle and higher income countries) and the organization type ( 5). ]
- October 1994 Fees: Membership Fee (in USD) = (Base Fee * Multiply), Base Fee: 50,000 USD
- 1 July 2002 Fees: The basic fee increased to 57,000 USD due to inflationary savings.
- 1 January 2003 Fees: Paying became international as three currencies were introduced into the paying policy of W3C; USD, EUR, JPY. In this case the exchange rates fixed Were Following The equation Exchange rate = mean Interbank exchange rate / six months. The new base fees were: 57,500 USD, 60,540 EUR, 7,076,460 JPY
- 1 April 2005 Fees:
"In Europe, the Middle East, and Africa: 60,540 EUR Japan and Korea: 7,076,460 JPY All other countries: 57,500 USD" 
- 1 July 2005 Fees:
"In Europe, the Middle East, and Africa: 65,000 EUR Japan and Korea: 7,300,000 JPY All other countries: 63,500 USD" 
- 1 April 2007 Fees: W3C interrupted its policy of calculating the Multiplier by using the Intermediate Fee level. This level differs between each currency; 51,000,000 EUR, 5,750,000,000 JPY, 50,000,000 USD
- 1 October 2008 Fees: Specific characteristics owned by each company would influence membership fees. In fact, these are the characteristics of the business (for-profit, non-profit organizations, government agencies and other organizations), annual gross revenue and country of headquarters. 
- 1 January 2010 Fees: The fees remained constant, however new members could only ensure one-year term. 
- February 1, 2012 Fees: Incumbent organizations can participate in W3C with a startup level fee. These organizations should have “annual gross revenues of EUR 2.25M / 250M JPY / USD 3M”,  having a working force of 10 or less and to experience working with W3C. 
- 1 July 2013 Fees: W3C introduced a new currency, CNY
- 1 October 2014 Addition of Introductory Industry Membership: “The two year” on-ramp “Membership has a lower membership than regular Membership and a corresponding lower fee.” 
- Jump up^ “CSS WG members” . w3.org . Retrieved 3 December 2017 .
- Jump up^ “CSS1 Test Suite: Acknowledgments” . w3.org . Retrieved 3 December 2017 .
- ^ Jump up to:a b c d “Cascading Style Sheets, designing for the Web – Chapter 20: The CSS saga” . w3.org . Retrieved 3 December 2017 .
- Jump up^ “Membership Benefits – W3C” . w3.org . Retrieved 3 December 2017 .
- Jump up^ “About Membership W3C: Membership Fees (April 2007)” . w3.org . Retrieved 3 December 2017 .
- Jump up^  [ dead link ]
- Jump up^  [ dead link ]
- Jump up^ “About W3C Membership: Membership Fees (October 2008)” . w3.org . Retrieved 3 December 2017 .
- ^ Jump up to:a b “History Member Fee – W3C” . w3.org . Retrieved 3 December 2017 .
- ^ Jump up to:a b “Membership Fees (February 2012) – W3C” . w3.org . Retrieved 3 December 2017 .