CSS current work & how to participate

CSS spec-i-fi-ca-tions

This page contains a list of all completed specifications and drafts by the CSS WG (formerly ‘CSS & FP WG’). If you want to follow the development of CSS3, this is the place to start. You have ideas? Contributions? See ‘If you want to help’ on this page.

A specification is not a manual. There is no excuse for badly written drafts and please complain if you find one. But specs do target a specific audience. See fantasai's Understanding the CSS Specifications.. J. David Eisenberg has written another useful How to read W3C specs. Or you can read about ‘modules,’ ‘levels,’ ‘snapshots’ and the CSS process.

What's new? (Also available as Atom news feed.)

Ta-ble of spec-i-fi-ca-tions

Ordered from most to least stable:

Com-pleted Cur-rent Up-com-ing Notes ??
CSS Snapshot 2018 NOTE Latest stable CSS ??
CSS Snapshot 2017 NOTE ??
CSS Snapshot 2015 NOTE ??
CSS Snapshot 2010 NOTE ??
CSS Snapshot 2007 NOTE ??
CSS Color Level?3 REC REC ??
CSS Namespaces REC REC ??
Selectors Level?3 REC REC ??
CSS Level?2 Revision?1 REC REC See Errata ??
Media Queries REC REC ??
CSS Style Attributes REC REC ??
CSS Fonts Level?3 REC REC ??
CSS Writing Modes Level?3 REC REC ??
CSS Basic User Interface Level?3 REC REC ??
CSS Containment Level?1 REC REC ??
Stable Cur-rent Up-com-ing Notes ??
CSS Backgrounds and Borders Level?3 CR PR ??
CSS Conditional Rules Level?3 CR CR ??
CSS Multi-column Layout Level?1 WD CR ??
CSS Values and Units Level?3 CR PR ??
CSS Flexible Box Layout Level?1 CR PR ??
CSS Cascading and Inheritance Level?3 CR PR ??
CSS Counter Styles Level?3 CR PR ??
Testing Cur-rent Up-com-ing Notes ??
CSS Images Level?3 CR CR ??
CSS Speech CR CR ??
CSS Text Decoration Level?3 CR CR ??
CSS Shapes Level?1 CR CR ??
CSS Masking Level?1 CR CR ??
CSS Fragmentation Level?3 CR PR ??
CSS Transforms Level?1 CR PR ??
CSS Cascading Variables CR PR ??
Compositing and Blending Level?1 CR CR ??
CSS Syntax Level?3 CR CR ??
CSS Grid Layout Level?1 CR PR ??
CSS Display Level?3 CR CR ??
CSS Will Change Level?1 CR PR ??
Media Queries Level?4 CR PR ??
Geometry Interfaces Level?1 CR CR ??
CSS Cascading and Inheritance Level?4 CR PR ??
CSS Scroll Snap Level?1 CR PR ??
CSS Painting API Level?1 CR PR ??
CSS Easing Functions Level?1 CR WD ??
CSS Writing Modes Level?4 CR PR ??
Refining Cur-rent Up-com-ing Notes ??
CSS Animations Level?1 WD WD ??
Web Animations WD WD ??
CSS Text Level?3 WD CR ??
CSS Transitions WD CR ??
CSS Box Alignment Level?3 WD WD ??
Selectors Level?4 WD WD ??
CSS Lists Level?3 WD WD ??
Motion Path Level?1 WD WD ??
Preview of CSS Level?2 FPWD NOTE ??
CSS Color Level?4 WD WD ??
CSS Fonts Level?4 WD WD ??
CSS Logical Properties and Values Level?1 WD WD ??
Revising Cur-rent Up-com-ing Notes ??
CSS Paged Media Level?3 WD WD ??
CSS Intrinsic & Extrinsic Sizing Level?3 WD CR ??
CSS Ruby Layout Level?1 WD WD ??
CSS Overflow Level?3 WD WD ??
CSS Box Model Level?3 WD WD ??
CSS Pseudo-Elements Level?4 WD WD ??
CSS Scrollbars Level?1 FPWD WD ??
CSS Box Sizing Level?4 FPWD WD ??
Exploring Cur-rent Up-com-ing Notes ??
CSS Backgrounds and Borders Level?4 FPWD ??
CSS Device Adaptation WD WD ??
CSS Exclusions WD WD ??
Filter Effects Level?1 WD WD ??
CSS Generated Content for Paged Media WD WD ??
CSS Page Floats FPWD WD ??
CSS Template Layout NOTE NOTE ??
CSS Line Grid WD WD ??
CSS Positioned Layout Level?3 WD WD ??
CSS Regions WD WD ??
CSS Table Level?3 WD WD ??
CSS Object Model WD WD ??
CSS Font Loading WD WD ??
CSS Scoping Level?1 FPWD WD ??
CSS Inline Layout Level?3 WD WD ??
CSS Round Display Level?1 WD WD ??
CSS Basic User Interface Level?4 WD WD ??
CSS Text Level?4 WD WD ??
CSS Properties and Values API Level?1 WD WD ??
CSS Typed OM Level?1 WD WD ??
Worklets Level?1 FPWD WD ??
CSS Rhythmic Sizing Level?1 FPWD WD ??
CSS Image Values and Replaced Content Level?4 WD WD ??
CSS Fill and Stroke Level?3 FPWD WD ??
CSS Overflow Level?4 FPWD WD ??
CSS Grid Layout Level?2 WD WD ??
CSS Text Decoration Level?4 FPWD WD ??
CSS Layout API Level?1 FPWD WD ??
CSS Values and Units Level?4 WD WD ??
CSS Shadow Parts FPWD WD ??
CSS Fragmentation Level?4 FPWD WD ??
CSS Spatial Navigation Level?1 WD WD ??
CSS Color Adjustment Level?1 WD WD ??
CSS Overscroll Behavior Level?1 FPWD WD ??
CSS Animation Worklet API FPWD WD ??
CSS Containment Level?2 WD WD ??
CSS Scroll Anchoring Level?1 FPWD WD ??
Resize Observer FPWD WD ??
CSS Color Level?5 FPWD WD ??
CSS Transforms Level?2 FPWD WD ??
CSS Conditional Rules Level?4 FPWD WD ??
Media Queries Level?5 FPWD WD ??
CSS Box Model Level?4 FPWD WD ??
Rewriting Cur-rent Up-com-ing Notes ??
CSS Generated Content Level?3 WD WD ??
Abandoned Cur-rent Up-com-ing Notes ??
CSS Level?1 SPSD ??
CSS Mobile Profile?2.0 NOTE ??
Non-element Selectors NOTE ??
The CSS 'Reader' Media Type NOTE ??
CSS Presentation Levels NOTE ??
CSS TV Profile?1.0 NOTE ??
CSS Marquee NOTE ??
Behavioral Extensions to CSS NOTE ??
Fullscreen NOTE ??

Some related specifications by other Working Groups:

Title Cur-rent Notes
Predefined Counter Styles NOTE I18N WG
CSS Techniques for Web Content Accessibility Guidelines?1.0 NOTE WCAG WG
Associating Style Sheets with XML documents?1.0 (Second Edition) REC XML Core WG
Web App Manifest WD Web Applications WG
Selectors API Level?1 REC Web Applications WG

Two old specifications by the Web Applications WG, The 'view-mode' Media Feature and Selectors API Level?2, have been replaced by Web App Manifest and DOM, respectively.

Indexes of properties & descriptors

Jens Meiert maintains an index of properties. The CSS Snapshot includes an index of standard and stable properties, along with pseudo-classes & pseudo-elements and @-rules.

People who are reviewing CSS drafts might also be interested in these indexes that include both official and editors' drafts: properties [HTML] [TSV] [XML] [JSON] and descriptors [HTML] [TSV] [XML] [JSON].

Ex-pla-na-tion of col-ors & status codes

W3C indicates the maturity of specifications by a status code. The CSS working group uses the following, from least to most stable:

Ab-bre-vi-a-tion Full name
FPWD First Public Working Draft
WD Working Draft
CR Candidate Recommendation
PR Proposed Recommendation
REC Recommendation
SPSD Superseded Recommendation

The following code indicates a document that is not intended to become a standard:

Ab-bre-vi-a-tion Full name
NOTE Working Group Note

The names are defined in section?6 of the W3C process document. A REC is what is normally referred to as a ‘standard.’ W3C encourages everyday use starting from CR.

The informal stability levels used to group the specs are defined in this 2007 description of CSS stability levels.

If you want to help

Everybody can take part in the discussions on the archived mailing list [email protected]. You can subscribe yourself. This is the preferred place for discussions, because the members of the working group will see them. Please, don't use this list for questions of the type How do I… Use comp. infosystems. www. authoring. stylesheets ("ciwas") or see ‘Learning CSS’.

On the mailing list, you will be talking to many people, many very busy people. Before you post, please, search the archive to see if your great idea has maybe already been discussed. Follow the usual netiquette and W3C's policies on spam, attachments, etc.

If you are sending comments on a specific CSS module, please prefix the subject of your message with the appropriate spec code (given in the ‘Status of this document’ section) in brackets, e.g. ‘[css3-flexbox] error in margin calculations’. This will help the editors find and track your comments.

Laurens Holst (a.k.a. ‘Grauw’) maintains an FAQ for www-style. (For additions, please, contact Laurens directly. Laurens is not associated with W3C.)

You can also raise issues via GitHub. Github contains copies of the editors' drafts of the CSS specifications and ‘Houdini’ APIs.

Birkir Gunnarsson wrote a helpful guide Mastering GitHub with a screen reader, part 1.

If you work for a W3C member organization, you can also join the CSS working group and come to its meetings. To participate, you need to commit to (on average) 1?day per week. Contact me (Bert Bos) or your organization's W3C contact person. The group's minutes are public and posted on the CSS WG blog.

There are many ways to keep up to date with new publications by the CSS WG. The ‘What's new?’ section above shows the most recent drafts and it also has an Atom feed. Publications are announced on the CSS WG's blog and its Atom feed, and the group's Mastodon and Twitter accounts. First drafts from all W3C working groups appear on the public-review-announce mailing list and its RSS feed. The latest publications from all W3C working groups are at the top of the Technical Reports page, which also has an RSS feed.

About the test suites

The CSS working group intends to spend a lot of time on developing the CSS test suites along with the CSS specifications. By providing a test suite for each module as soon as the module is published, we hope not only that CSS3 implementations will conform to the specification much earlier, but also that people will have an easier time understanding the formal text of the spec.

The test suites have their own archived mailing list [email protected]. Please send error reports, test case submissions, and any other questions and comments about the CSS test suites there. Elika Etemad maintains the CSS Testing Wiki with more info for contributors.

Raising issues via GitHub is also possible: see the Web-platform tests repository.

Mark-up con-ven-tions

The source mark-up of the specifications follows certain conventions (which is useful for automatic processing).

Bert Bos, style activity lead
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Last updated Fri 19 Jun 2020 08:11:32 AM UTC


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