Cascading Style Sheets (CSS) Working Group

Licensing Commitments

Participants in this group have made certain licensing commitments by joining the group. In addition to these Participants, non-participating W3C Member may have made licensing commitments.

W3C Members not participating in this group who wish to make the same licensing commitments for specifications developed by this group may do so through a Join form for licensing commitments from non-participating Members.

Other parties making a substantive contribution to the work of the group need to make a Royalty-Free patent commitment, as described in section 6.2.6 of the Process. Team contacts will provide instructions for recording the non-participant licensing commitment before the contribution can be accepted.

Participation

W3C Member Organizations

360
ACCESS CO., LTD.
Adobe
Airbnb Inc
Amazon
Apple, Inc.
BFO
Bocoup
BPS Co., Ltd.
British Broadcasting Corporation
China Mobile Communications Corporation
Disruptive Innovations
Electronics and Telecommunications Research Institute
eyeo GmbH
Fronteers
Google, Inc.
IAB Technology Laboratory, Inc.
IBM Corporation
Igalia
Intel Corporation
Knowbility
Kodansha, Publishers, Ltd.
LG Electronics
Magic Leap, Inc.
Microsoft Corporation
Mitsubishi Electric Corporation
Monotype
MovieLabs
Mozilla Foundation
Netflix Inc.
NIC.br - Brazilian Network Information Center
Nippon Telegraph & Telephone Corp.
OpenJS Foundation
Pearson plc
Rakuten, Inc.
Salesforce
Samsung Electronics Co., Ltd.
Shenzhen Institute of Information Technology
Shopify
Stripe
Tencent
TetraLogical
The New York Times
The Paciello Group, LLC
The Washington Post
Viacom inc.
Voyager Japan, Inc.
WIRIS Science

Invited Experts

David Baron
Amelia Bellamy-Royds
Brian Birtles
John Daggett
Elika Etemad
Dael Jackson
Brad Kemper
Jirka Kosek
Peter Linss
Anton Prowse
Françoi Remy
Florian Rivoal
Miriam Suzanne
GérardTalbot
Lea Verou
Sebastian Zartner

W3C Staff

Bert Bos
Richard Ishida
Philippe Le Hégart
Chris Lilley
Fuqiao Xue

See also the list of individuals participating in this group.

The Call for Participation for this group was announced on 03 Oct 2019; see the Patent Policy FAQ for information about continued participation before re-joining the group.

Specifications published by the Group

The following is the list of specifications produced by the Cascading Style Sheets (CSS) Working Group that have associated disclosures obligations, and possible licensing obligations under the W3C Patent Policy.

Documents under the W3C Patent Policy

Documents not/no longer under the W3C Patent Policy

Patent Disclosures and Claim Exclusions

This section summarizes patent disclosures by participants in W3C's Cascading Style Sheets (CSS) Working Group as required by section 6 of the W3C Patent Policy.

W3C takes no position regarding either:

the validity or scope of any intellectual property right or other rights that might be claimed to pertain to the implementation or use of the technology, or
the extent to which any license under such rights might or might not be available from those not participating in this group.

Where disclosure is required by a W3C Member, the AC Representative makes the disclosure.

Anyone else may also make a disclosure.

Known Disclosures

Disclosures for CSS Mobile Profile 2.0	Licensing	Notes
Issued patent '6209009' (US) held by Openwave Systems Inc. disclosed on 28 Nov 2006

Disclosures for CSS 2D Transforms	Licensing	Notes
Laid-open/published patent application #12/397,325 (US) held by Apple, Inc. disclosed on 24 Sep 2009	Patent Policy Obligations

Disclosures for CSS 3D Transforms Module Level 3	Licensing	Notes
Laid-open/published patent application #12/397,325 (US) held by Apple, Inc. disclosed on 24 Sep 2009	Patent Policy Obligations

Disclosures for CSS Animations Level 1	Licensing	Notes
Laid-open/published patent application #12/397,325 (US) held by Apple, Inc. disclosed on 24 Sep 2009	Patent Policy Obligations

Disclosures for CSS Transitions	Licensing	Notes
Laid-open/published patent application #12/397,325 (US) held by Apple, Inc. disclosed on 24 Sep 2009	Patent Policy Obligations

How to Make a Patent Disclosure

W3C Members and Invited Experts (including those not participating in this group) wishing to disclose a patent for a specification produced by the Cascading Style Sheets (CSS) Working Group can select the specification on the list above and use the disclosure form linked from there.

Disclosures from the general public should be sent to the W3C Staff.

For specifications developed under the W3C Patent Policy, parties that commit to the W3C Royalty-Free Licensing Terms are not required to disclose patents. Any party (not just the Working Group Participants) may commit to the W3C Royalty-Free Licensing Terms and may do so by following the instructions in the next section.

Claim Exclusions

Only Cascading Style Sheets (CSS) Working Group participants may exclude patent claims concerning specifications developed under the W3C Patent Policy, per section 4 of the W3C Patent Policy. To make an exclusion, participants should use the exclusion form linked from the specification page on the list above but only after disclosing the patent first.

Exclusion Opportunities

The Patent Policy FAQ provides detailed information about exclusion opportunities, that is, when a Working Group Participant can exclude a patent claim.

Each exclusion opportunity has a duration. See section 4.1 of the W3C Patent Policy for information on how the exclusion deadline is calculated.

At each exclusion opportunity, Participants may exclude patent claims with respect to a body of text. The Exclusion Draft is the reference body of text for the current exclusion opportunity.

Note: At each new exclusion opportunity (e.g., in the case of a second Candidate Recommendation Snapshot), exclusions are only with respect to differences since the previous reference body of text. These differences may be less than an entire document, and the summary below does not address that granularity. Also, in some edge cases (discussed in the FAQ), Participants, depending on when they joined the Working Group, will have different Exclusion Drafts; the summary below does not reflect this case.

Exclusion Opportunities

CSS Custom Highlight API Module Level 1: Call for exclusion started on 2020/10/22, opportunity until 2021/03/21

CSS Box Sizing Module Level 4: Call for exclusion started on 2020/05/26, opportunity until 2020/10/23
CSS Grid Layout Module Level 1: Call for exclusion started on 2020/08/18, opportunity until 2020/10/17
CSS Grid Layout Module Level 2: Call for exclusion started on 2020/08/18, opportunity until 2020/10/17
Media Queries Level 4: Call for exclusion started on 2020/07/21, opportunity until 2020/09/19
CSS Box Model Module Level 4: Call for exclusion started on 2020/04/21, opportunity until 2020/09/18
Media Queries Level 5: Call for exclusion started on 2020/03/03, opportunity until 2020/07/31
CSS Transforms Module Level 2: Call for exclusion started on 2020/03/03, opportunity until 2020/07/31
CSS Conditional Rules Module Level 4: Call for exclusion started on 2020/03/03, opportunity until 2020/07/31
CSS Color Module Level 5: Call for exclusion started on 2020/03/03, opportunity until 2020/07/31
CSS Scroll Anchoring Module Level 1: Call for exclusion started on 2020/02/11, opportunity until 2020/07/10
Resize Observer: Call for exclusion started on 2020/02/11, opportunity until 2020/07/10
CSS Speech Module: Call for exclusion started on 2020/03/10, opportunity until 2020/05/09
CSS Containment Module Level 2: Call for exclusion started on 2019/10/15, opportunity until 2020/03/13
CSS Images Module Level 3: Call for exclusion started on 2019/10/10, opportunity until 2019/12/09
CSS Animation Worklet API: Call for exclusion started on 2019/06/25, opportunity until 2019/11/22
CSS Overscroll Behavior Module Level 1: Call for exclusion started on 2019/06/06, opportunity until 2019/11/03
CSS Writing Modes Level 3: Call for exclusion started on 2019/09/03, opportunity until 2019/11/02
CSS Color Adjust Module Level 1: Call for exclusion started on 2019/05/21, opportunity until 2019/10/18
CSS Text Decoration Module Level 3: Call for exclusion started on 2019/08/13, opportunity until 2019/10/12
CSS Writing Modes Level 4: Call for exclusion started on 2019/07/30, opportunity until 2019/09/28
CSS Writing Modes Level 3: Call for exclusion started on 2019/07/30, opportunity until 2019/09/28
CSS Spatial Navigation Level 1: Call for exclusion started on 2019/04/23, opportunity until 2019/09/20
CSS Syntax Module Level 3: Call for exclusion started on 2019/07/16, opportunity until 2019/09/14
CSS Display Module Level 3: Call for exclusion started on 2019/07/11, opportunity until 2019/09/09
CSS Values and Units Module Level 3: Call for exclusion started on 2019/06/06, opportunity until 2019/08/05
CSS Containment Module Level 1: Call for exclusion started on 2019/04/30, opportunity until 2019/06/29
CSS Easing Functions Level 1: Call for exclusion started on 2019/04/30, opportunity until 2019/06/29
CSS Fragmentation Module Level 4: Call for exclusion started on 2018/12/18, opportunity until 2019/05/17
CSS Transforms Module Level 1: Call for exclusion started on 2019/02/14, opportunity until 2019/04/15
CSS Shadow Parts: Call for exclusion started on 2018/11/15, opportunity until 2019/04/14
CSS Scroll Snap Module Level 1: Call for exclusion started on 2019/01/31, opportunity until 2019/04/01
CSS Values and Units Module Level 3: Call for exclusion started on 2019/01/31, opportunity until 2019/04/01
CSS Scrollbars Module Level 1: Call for exclusion started on 2018/09/25, opportunity until 2019/02/22
CSS Fragmentation Module Level 3: Call for exclusion started on 2018/12/04, opportunity until 2019/02/02
Geometry Interfaces Module Level 1: Call for exclusion started on 2018/12/04, opportunity until 2019/02/02
CSS Values and Units Module Level 4: Call for exclusion started on 2018/08/14, opportunity until 2019/01/11
CSS Flexible Box Layout Module Level 1: Call for exclusion started on 2018/11/08, opportunity until 2019/01/07
CSS Containment Module Level 1: Call for exclusion started on 2018/11/08, opportunity until 2019/01/07
CSS Cascading and Inheritance Level 4: Call for exclusion started on 2018/08/28, opportunity until 2018/10/27
CSS Display Module Level 3: Call for exclusion started on 2018/08/28, opportunity until 2018/10/27
CSS Cascading and Inheritance Level 3: Call for exclusion started on 2018/08/28, opportunity until 2018/10/27
CSS Values and Units Module Level 3: Call for exclusion started on 2018/08/14, opportunity until 2018/10/13
CSS Scroll Snap Module Level 1: Call for exclusion started on 2018/08/14, opportunity until 2018/10/13
CSS Painting API Level 1: Call for exclusion started on 2018/08/09, opportunity until 2018/10/08
CSS Layout API Level 1: Call for exclusion started on 2018/04/12, opportunity until 2018/09/09
CSS Text Decoration Module Level 3: Call for exclusion started on 2018/07/03, opportunity until 2018/09/01
CSS Fonts Module Level 3: Call for exclusion started on 2018/06/26, opportunity until 2018/08/25
CSS Text Decoration Module Level 4: Call for exclusion started on 2018/03/13, opportunity until 2018/08/10
CSS Containment Module Level 1: Call for exclusion started on 2018/05/24, opportunity until 2018/07/23
CSS Writing Modes Level 4: Call for exclusion started on 2018/05/24, opportunity until 2018/07/23
CSS Writing Modes Level 3: Call for exclusion started on 2018/05/24, opportunity until 2018/07/23
CSS Grid Layout Module Level 2: Call for exclusion started on 2018/02/06, opportunity until 2018/07/06
CSS Fonts Module Level 3: Call for exclusion started on 2018/03/15, opportunity until 2018/05/14
CSS Writing Modes Level 4: Call for exclusion started on 2017/12/07, opportunity until 2018/05/06
Selectors Level 3: Call for exclusion started on 2018/01/30, opportunity until 2018/03/31
CSS Grid Layout Module Level 1: Call for exclusion started on 2017/12/14, opportunity until 2018/02/12
CSS Counter Styles Level 3: Call for exclusion started on 2017/12/14, opportunity until 2018/02/12
CSS Scroll Snap Module Level 1: Call for exclusion started on 2017/12/14, opportunity until 2018/02/12
CSS Writing Modes Level 3: Call for exclusion started on 2017/12/07, opportunity until 2018/02/05
CSS Color Module Level 3: Call for exclusion started on 2017/12/05, opportunity until 2018/02/03
CSS Flexible Box Layout Module Level 1: Call for exclusion started on 2017/10/19, opportunity until 2017/12/18
CSS Backgrounds and Borders Module Level 3: Call for exclusion started on 2017/10/17, opportunity until 2017/12/16
CSS Fonts Module Level 4: Call for exclusion started on 2017/07/11, opportunity until 2017/12/08
CSS Overflow Module Level 4: Call for exclusion started on 2017/06/13, opportunity until 2017/11/10
Media Queries Level 4: Call for exclusion started on 2017/09/05, opportunity until 2017/11/04
CSS Scroll Snap Module Level 1: Call for exclusion started on 2017/08/24, opportunity until 2017/10/23
CSS Logical Properties and Values Level 1: Call for exclusion started on 2017/05/18, opportunity until 2017/10/15
CSS Containment Module Level 1: Call for exclusion started on 2017/08/08, opportunity until 2017/10/07
CSS Fill and Stroke Module Level 3: Call for exclusion started on 2017/04/13, opportunity until 2017/09/10
CSS Rhythmic Sizing: Call for exclusion started on 2017/03/02, opportunity until 2017/07/30
CSS Timing Functions Level 1: Call for exclusion started on 2017/02/21, opportunity until 2017/07/21
CSS Containment Module Level 1: Call for exclusion started on 2017/02/21, opportunity until 2017/07/21
CSS Grid Layout Module Level 1: Call for exclusion started on 2017/05/09, opportunity until 2017/07/08
CSS Basic User Interface Module Level 3 (CSS3 UI): Call for exclusion started on 2017/03/02, opportunity until 2017/05/01
CSS Table Module Level 3: Call for exclusion started on 2016/10/25, opportunity until 2017/03/24
CSS Scroll Snap Module Level 1: Call for exclusion started on 2016/10/24, opportunity until 2016/12/23
CSS Color Module Level 4: Call for exclusion started on 2016/07/05, opportunity until 2016/12/02
CSS Grid Layout Module Level 1: Call for exclusion started on 2016/09/29, opportunity until 2016/11/28
Worklets Level 1: Call for exclusion started on 2016/06/07, opportunity until 2016/11/04
CSS Painting API Level 1: Call for exclusion started on 2016/06/07, opportunity until 2016/11/04
CSS Properties and Values API Level 1: Call for exclusion started on 2016/06/07, opportunity until 2016/11/04
CSS Typed OM Level 1: Call for exclusion started on 2016/06/07, opportunity until 2016/11/04
Cascading Style Sheets Level 2 Revision 2 (CSS 2.2) Specification: Call for exclusion started on 2016/04/12, opportunity until 2016/09/09
CSS Flexible Box Layout Module Level 1: Call for exclusion started on 2016/05/26, opportunity until 2016/07/25
CSS Flexible Box Layout Module Level 1: Call for exclusion started on 2016/03/02, opportunity until 2016/05/01
CSS Fragmentation Module Level 3: Call for exclusion started on 2016/01/14, opportunity until 2016/03/14
CSS Cascading and Inheritance Level 4: Call for exclusion started on 2016/01/14, opportunity until 2016/03/14
CSS Round Display Level 1: Call for exclusion started on 2015/09/23, opportunity until 2016/02/20
CSS Text Module Level 4: Call for exclusion started on 2015/09/23, opportunity until 2016/02/20
CSS Basic User Interface Module Level 4: Call for exclusion started on 2015/09/23, opportunity until 2016/02/20
CSS Namespaces Module: Call for exclusion started on 2015/12/17, opportunity until 2016/02/15
CSS Page Floats: Call for exclusion started on 2015/09/16, opportunity until 2016/02/13
CSS Writing Modes Level 3: Call for exclusion started on 2015/12/15, opportunity until 2016/02/13
CSS Will Change Module Level 1: Call for exclusion started on 2015/12/04, opportunity until 2016/02/02
CSS Custom Properties for Cascading Variables Module Level 1: Call for exclusion started on 2015/12/04, opportunity until 2016/02/02
CSS Cascading and Inheritance Level 4: Call for exclusion started on 2015/04/21, opportunity until 2015/09/18
CSS Flexible Box Layout Module Level 1: Call for exclusion started on 2015/07/15, opportunity until 2015/09/13
Motion Path Module Level 1: Call for exclusion started on 2015/04/09, opportunity until 2015/09/06
CSS Basic User Interface Module Level 3 (CSS3 UI): Call for exclusion started on 2015/07/07, opportunity until 2015/09/05
CSS Scroll Snap Points Module Level 1: Call for exclusion started on 2015/03/26, opportunity until 2015/08/23
CSS Values and Units Module Level 3: Call for exclusion started on 2015/06/11, opportunity until 2015/08/10
CSS Counter Styles Level 3: Call for exclusion started on 2015/06/11, opportunity until 2015/08/10
CSS Cascading and Inheritance Level 3: Call for exclusion started on 2015/04/20, opportunity until 2015/06/19
CSS Pseudo-Elements Module Level 4: Call for exclusion started on 2015/01/16, opportunity until 2015/06/15
CSS Inline Layout Module Level 3: Call for exclusion started on 2014/12/19, opportunity until 2015/05/18
CSS Counter Styles Level 3: Call for exclusion started on 2015/02/03, opportunity until 2015/04/04
Compositing and Blending Level 1: Call for exclusion started on 2015/01/14, opportunity until 2015/03/15
CSS Flexible Box Layout Module Level 1: Call for exclusion started on 2014/09/25, opportunity until 2014/11/24
Media Queries Level 4: Call for exclusion started on 2014/06/05, opportunity until 2014/11/02
Non-element Selectors Module Level 1: Call for exclusion started on 2014/06/03, opportunity until 2014/10/31
CSS Counter Styles Level 3: Call for exclusion started on 2014/08/28, opportunity until 2014/10/27
Geometry Interfaces Module Level 1: Call for exclusion started on 2014/05/22, opportunity until 2014/10/19
CSS Will Change Module Level 1: Call for exclusion started on 2014/05/01, opportunity until 2014/09/28
CSS Line Grid Module Level 1: Call for exclusion started on 2014/04/03, opportunity until 2014/08/31
CSS Scoping Module Level 1: Call for exclusion started on 2014/04/03, opportunity until 2014/08/31
Geometry Interfaces Module Level 1: Call for exclusion started on 2014/06/26, opportunity until 2014/08/25
CSS Font Loading Module Level 3: Call for exclusion started on 2014/05/22, opportunity until 2014/07/21
CSS Masking Module Level 1: Call for exclusion started on 2014/05/22, opportunity until 2014/07/21
CSS Display Module Level 3: Call for exclusion started on 2014/02/20, opportunity until 2014/07/20
CSS Font Loading Module Level 3: Call for exclusion started on 2014/02/20, opportunity until 2014/07/20
CSS Font Loading Module Level 3: Call for exclusion started on 2014/02/20, opportunity until 2014/07/20
CSS Custom Properties for Cascading Variables Module Level 1: Call for exclusion started on 2014/05/06, opportunity until 2014/07/05
CSS Flexible Box Layout Module Level 1: Call for exclusion started on 2014/03/26, opportunity until 2014/05/25
CSS Shapes Module Level 1: Call for exclusion started on 2014/02/12, opportunity until 2014/04/13
CSS Backgrounds and Borders Module Level 3: Call for exclusion started on 2014/02/04, opportunity until 2014/04/05
Compositing and Blending Level 1: Call for exclusion started on 2014/01/07, opportunity until 2014/03/08
DOMMatrix interface: Call for exclusion started on 2013/09/21, opportunity until 2014/02/18
CSS Shapes Module Level 1: Call for exclusion started on 2013/12/03, opportunity until 2014/02/01
CSS Writing Modes Level 3: Call for exclusion started on 2013/11/26, opportunity until 2014/01/25
CSS Syntax Module Level 3: Call for exclusion started on 2013/11/06, opportunity until 2014/01/05
CSS Masking Module Level 1: Call for exclusion started on 2013/10/30, opportunity until 2013/12/29
CSS Masking Module Level 1: Call for exclusion started on 2013/10/29, opportunity until 2013/12/28
Compositing and Blending Level 1: Call for exclusion started on 2013/10/11, opportunity until 2013/12/10
CSS Text Module Level 3: Call for exclusion started on 2013/10/10, opportunity until 2013/12/09
Web Animations 1.0: Call for exclusion started on 2013/06/25, opportunity until 2013/11/22
CSS Shapes Module Level 1: Call for exclusion started on 2013/06/21, opportunity until 2013/11/18
CSS Cascading and Inheritance Level 3: Call for exclusion started on 2013/07/30, opportunity until 2013/09/28
CSS Counter Styles Level 3: Call for exclusion started on 2013/07/18, opportunity until 2013/09/16
CSS Overflow Module Level 3: Call for exclusion started on 2013/04/18, opportunity until 2013/09/15
CSS Fonts Module Level 3: Call for exclusion started on 2013/07/12, opportunity until 2013/09/10
CSS Custom Properties for Cascading Variables Module Level 1: Call for exclusion started on 2013/06/21, opportunity until 2013/08/20
CSS Masking: Call for exclusion started on 2012/11/15, opportunity until 2013/04/14
Filter Effects 1.0: Call for exclusion started on 2012/10/25, opportunity until 2013/03/24
CSS Counter Styles Level 3: Call for exclusion started on 2012/10/09, opportunity until 2013/03/08
CSS Text Decoration Module Level 3: Call for exclusion started on 2013/01/03, opportunity until 2013/03/04
CSS Intrinsic & Extrinsic Sizing Module Level 3: Call for exclusion started on 2012/09/27, opportunity until 2013/02/24
CSS Conditional Rules Module Level 3: Call for exclusion started on 2012/12/13, opportunity until 2013/02/11
CSS Image Values and Replaced Content Module Level 4: Call for exclusion started on 2012/09/11, opportunity until 2013/02/08
Compositing and Blending 1.0: Call for exclusion started on 2012/08/21, opportunity until 2013/01/18
Compositing and Blending 1.0: Call for exclusion started on 2012/08/16, opportunity until 2013/01/13
Fullscreen: Call for exclusion started on 2012/07/03, opportunity until 2012/11/30
CSS Box Alignment Module Level 3: Call for exclusion started on 2012/06/13, opportunity until 2012/11/10
CSS Variables Module Level 1: Call for exclusion started on 2012/04/10, opportunity until 2012/09/07
CSS Flexible Box Layout Module: Call for exclusion started on 2012/06/13, opportunity until 2012/08/12
CSS Fragmentation Module Level 3: Call for exclusion started on 2012/03/13, opportunity until 2012/08/10
CSS Fragmentation Module Level 3: Call for exclusion started on 2012/03/12, opportunity until 2012/08/09
CSS Positioned Layout Module Level 3: Call for exclusion started on 2012/02/08, opportunity until 2012/07/07
CSS Backgrounds and Borders Module Level 3: Call for exclusion started on 2012/03/12, opportunity until 2012/05/11
CSS Values and Units Module Level 3: Call for exclusion started on 2012/03/12, opportunity until 2012/05/11
CSS Exclusions and Shapes Module Level 3: Call for exclusion started on 2011/12/13, opportunity until 2012/05/11
CSS Image Values and Replaced Content Module Level 3: Call for exclusion started on 2012/01/12, opportunity until 2012/03/12
Selectors Level 4: Call for exclusion started on 2011/09/29, opportunity until 2012/02/26
CSS3 Ruby Module: Call for exclusion started on 2011/09/19, opportunity until 2012/02/16
CSS Device Adaptation: Call for exclusion started on 2011/09/15, opportunity until 2012/02/12
CSS Conditional Rules Module Level 3: Call for exclusion started on 2011/09/12, opportunity until 2012/02/09
CSSOM: Call for exclusion started on 2011/09/12, opportunity until 2012/02/09
CSS Speech Module: Call for exclusion started on 2011/09/12, opportunity until 2011/11/11
CSS Regions Module: Call for exclusion started on 2011/06/09, opportunity until 2011/11/06
Grid Layout: Call for exclusion started on 2011/04/07, opportunity until 2011/09/04
Cascading Style Sheets (CSS) Snapshot 2010: Call for exclusion started on 2010/12/07, opportunity until 2011/05/06
Cascading Style Sheets (CSS) Snapshot 2007: Call for exclusion started on 2010/07/27, opportunity until 2010/09/25
CSS Backgrounds and Borders Module Level 3: Call for exclusion started on 2010/06/15, opportunity until 2010/08/14
Flexible Box Layout Module: Call for exclusion started on 2009/07/23, opportunity until 2009/12/20
CSS Image Values Module Level 3: Call for exclusion started on 2009/07/23, opportunity until 2009/12/20
CSS Backgrounds and Borders Module Level 3: Call for exclusion started on 2009/10/15, opportunity until 2009/12/14
Media Queries: Call for exclusion started on 2009/04/23, opportunity until 2009/09/20
CSS3 module: Multi-column layout: Call for exclusion started on 2009/06/30, opportunity until 2009/08/29
CSS 2D Transforms Module Level 3: Call for exclusion started on 2009/03/23, opportunity until 2009/08/20
CSS 3D Transforms Module Level 3: Call for exclusion started on 2009/03/23, opportunity until 2009/08/20
CSS Animations Module Level 3: Call for exclusion started on 2009/03/23, opportunity until 2009/08/20
CSS Transitions Module Level 3: Call for exclusion started on 2009/03/23, opportunity until 2009/08/20
Selectors Level 3: Call for exclusion started on 2009/03/10, opportunity until 2009/05/09
CSS Marquee Module Level 3: Call for exclusion started on 2008/08/01, opportunity until 2008/09/30
CSS Color Module Level 3: Call for exclusion started on 2008/07/22, opportunity until 2008/09/20
CSSOM View Module: Call for exclusion started on 2008/02/28, opportunity until 2008/07/27
CSS Namespaces Module: Call for exclusion started on 2008/02/15, opportunity until 2008/04/15
Cascading Style Sheets (CSS) Snapshot 2007: Call for exclusion started on 2007/10/19, opportunity until 2008/03/17
CSS Grid Positioning Module Level 3: Call for exclusion started on 2007/09/11, opportunity until 2008/02/08
CSS Mobile Profile 2.0: Call for exclusion started on 2007/10/19, opportunity until 2007/12/18
Cascading Style Sheets, level 2 revision 1: Call for exclusion started on 2006/11/06, opportunity until 2007/01/05

Additional Licensing Information

As described in section 5 of the W3C Patent Policy:

All Working Group participants are encouraged to provide a contact from which licensing information can be obtained and other relevant licensing information. Any such information will be made publicly available along with the patent disclosures for the Working Group in question.

Patent holders may:

Provide additional licensing information for documents produced by this Working Group
Provide the same additional licensing information for all documents with associated licensing obligations produced by this Working Group, or
Provide additional licensing information for any W3C document with associated licensing obligations produced by any W3C Working Group under the W3C Patent Policy.

Such licensing information should be sent to the W3C Staff.

Please recall that, per section 5 of the W3C Patent Policy, a W3C Royalty-Free license:

may not impose any further conditions or restrictions on the use of any technology, intellectual property rights, or other restrictions on behavior of the licensee, but may include reasonable, customary terms relating to operation or maintenance of the license relationship such as the following: choice of law and dispute resolution.