DRAFT WebFonts Working Group Charter

The mission of the Web Fonts Working Group is to develop specifications that allow the interoperable deployment of downloadable fonts on the Web.

Join the WebFonts Working Group.

This proposed charter is available on GitHub. Feel free to raise issues.

Charter Status See the group status page and detailed change history.
Start date [dd monthname yyyy] (date of the "Call for Participation", when the charter is approved)
End date [dd monthname yyyy] (Start date + 2 years)
Chairs Vladimir Levantovsky (W3C Invited Experts)
Garret Rieger (Google)
Team Contacts Chris Lilley (0.14 FTE)
Meeting Schedule Teleconferences: 1-hour calls will be held weekly or as needed
Face-to-face: we will meet during the W3C's annual Technical Plenary week; additional face-to-face meetings may be scheduled by consent of the participants, usually no more than 3 per year.

Motivation and Background

The Web Fonts WG is developing a technology, Incremental Font Transfer, whereby the client loads only the portion(s) of the font that they actually need, significantly reducing data transfer. Multiple incremental additions to the same font are possible, such as a user agent updating a font as a user browses multiple pages. This is especially helpful for languages with large character repertoires, such as Chinese and Japanese. Incremental transfer improves on unicode-range by avoiding damage to layout (kerning, ligatures, etc) rules, meaning it can efficiently support fine grained increments to Latin and to complex scripts like Indic or Arabic. Incremental fonts can be deployed as static files to any standard HTTP server.

Scope

The Web Fonts WG develops Recommendation-track specifications for Incremental Font Transfer as listed under deliverables; tracks emerging implementations, and maintains communications with the typography, Web design and implementor communities.

Maintenance updates to the WOFF 1 and WOFF 2 specifications are also in scope.

Out of Scope

The following features are out of scope, and will not be addressed by this Working group.

  • Changes to the Open Font Format or OpenType specifications

Deliverables

Updated document status is available on the group publication status page.

Draft state indicates the state of the deliverable at the time of the charter approval. Expected completion indicates when the deliverable is projected to become a Recommendation, or otherwise reach a stable state.

Normative Specifications

The Working Group will deliver the following W3C normative specifications:

Incremental Font Transfer

This specification defines a method to incrementally transfer fonts from server to client. Incremental transfer allows clients to load only the portions of the font they actually need which speeds up font loads and reduces data transfer needed to load the fonts. A font can be loaded over multiple requests where each request incrementally adds additional data.

Draft state: Working Draft

Expected completion: Q2 2026

Latest publication: 2024-07-09

Exclusion Draft: https://www.w3.org/TR/2021/WD-IFT-20210907/
Exclusion period began on 2021-09-07 and ended on 2022-02-04.

Exclusion Draft Charter: Produced under Working Group Charter: https://www.w3.org/2020/12/web-fonts-wg-charter.html

In addition, the Working Group maintains the following W3C normative specifications:

WOFF File Format 1.0

WOFF provides lightweight, easy-to-implement compression of font data for use with CSS @font-face.

Latest publication: 2012-12-13

WOFF File Format 2.0

Based on experience with WOFF 1.0, which is widely deployed, this specification was developed to provide improved compression and thus lower use of network bandwidth, while still allowing fast decompression even on mobile devices. This is achieved by combining a content-aware preprocessing step and improved entropy coding, compared to the Flate compression used in WOFF 1.0.

Latest publication: 2024-08-08

Other Deliverables

Other non-normative documents may be created such as:

  • Use case and requirement documents;
  • Test suite and implementation report for the specifications;
  • Primer or Best Practice documents to support web developers when designing applications.

Success Criteria

In order to advance beyond Candidate Recommendation, each normative specification is expected to have at least two independent interoperable implementations of every feature defined in the specification, where interoperability can be verified by passing open test suites.

There should be testing plans for each specification, starting from the earliest drafts.

To promote interoperability, all changes made to specifications in Candidate Recommendation or to features that have deployed implementations should have tests. Testing efforts should be conducted via the Web Platform Tests project.

Each specification should contain separate sections detailing all known security and privacy implications for implementers, Web authors, and end users.

Each specification should contain a section on accessibility that describes the benefits and impacts, including ways specification features can be used to address them, and recommendations for maximising accessibility in implementations.

This Working Group expects to follow the TAG Web Platform Design Principles.

Coordination

For all specifications, this Working Group will seek horizontal review for accessibility, internationalization, privacy, and security with the relevant Working and Interest Groups, and with the TAG. Invitation for review must be issued during each major standards-track document transition, including FPWD. The Working Group is encouraged to engage collaboratively with the horizontal review groups throughout development of each specification. The Working Group is advised to seek a review at least 3 months before first entering CR and is encouraged to proactively notify the horizontal review groups when major changes occur in a specification following a review.

Additional technical coordination with the following Groups will be made, per the W3C Process Document:

W3C Groups

CSS Working Group
The Cascading Style Sheets (CSS) Working Group maintains CSS Fonts, which defines the WebFont linking mechanism.

External Organizations

ISO/IEC JTC1 SC29/WG3
The Web Fonts WG will, if needed, coordinate with SC29/WG3 regarding the Open Font Format (OpenType) specification. Changes to Open Font Format (OpenType) are out of scope of the WebFonts WG, although requirements may be communicated to SC29/WG3 if needed via the existing Class C liaison between W3C and SC29.

Participation

To be successful, this Working Group is expected to have 6 or more active participants for its duration, including representatives from the key implementors of this specification, and active Editors and Test Leads for each specification. The Chairs, specification Editors, and Test Leads are expected to contribute half of a working day per week towards the Working Group. There is no minimum requirement for other Participants.

The group encourages questions, comments and issues on its public mailing lists and document repositories, as described in Communication.

The group also welcomes non-Members to contribute technical submissions for consideration upon their agreement to the terms of the W3C Patent Policy.

Participants in the group are required (by the W3C Process) to follow the W3C Code of Conduct.

Communication

Technical discussions for this Working Group are conducted in public: the meeting minutes from teleconference and face-to-face meetings will be archived for public review, and technical discussions and issue tracking will be conducted in a manner that can be both read and written to by the general public. Working Drafts and Editor's Drafts of specifications will be developed in public repositories and may permit direct public contribution requests. The meetings themselves are not open to public participation, however.

Information about the group (including details about deliverables, issues, actions, status, participants, and meetings) will be available from the WebFonts Working Group home page.

Most WebFonts Working Group teleconferences will focus on discussion of particular specifications, and will be conducted on an as-needed basis.

This group primarily conducts its technical work on GitHub issues. The public is invited to review, discuss and contribute to this work.

The group may use a Member-confidential mailing list for administrative purposes and, at the discretion of the Chairs and members of the group, for member-only discussions in special cases when a participant requests such a discussion.

Decision Policy

This group will seek to make decisions through consensus and due process, per the W3C Process Document (section 5.2.1, Consensus). Typically, an editor or other participant makes an initial proposal, which is then refined in discussion with members of the group and other reviewers, and consensus emerges with little formal voting being required.

However, if a decision is necessary for timely progress and consensus is not achieved after careful consideration of the range of views presented, the Chairs may call for a group vote and record a decision along with any objections.

To afford asynchronous decisions and organizational deliberation, any resolution (including publication decisions) taken in a face-to-face meeting or teleconference will be considered provisional. A call for consensus (CfC) will be issued for all resolutions (for example, via email, GitHub issue or web-based survey), with a response period from one week to 10 working days, depending on the chair's evaluation of the group consensus on the issue. If no objections are raised by the end of the response period, the resolution will be considered to have consensus as a resolution of the Working Group.

All decisions made by the group should be considered resolved unless and until new information becomes available or unless reopened at the discretion of the Chairs.

This charter is written in accordance with the W3C Process Document (Section 5.2.3, Deciding by Vote) and includes no voting procedures beyond what the Process Document requires.

Patent Policy

This Working Group operates under the W3C Patent Policy (Version of 15 September 2020). To promote the widest adoption of Web standards, W3C seeks to issue Web specifications that can be implemented, according to this policy, on a Royalty-Free basis. For more information about disclosure obligations for this group, please see the licensing information.

Licensing

This Working Group will use the W3C Software and Document license for all its deliverables.

About this Charter

This charter has been created according to section 3.4 of the Process Document. In the event of a conflict between this document or the provisions of any charter and the W3C Process, the W3C Process shall take precedence.

Charter History

The following table lists details of all changes from the initial charter, per the W3C Process Document (section 4.3, Advisory Committee Review of a Charter):

Charter Period Start Date End Date Changes
Initial Charter, WOFF 1.0 17 Mar 2010 31 March 2012 none
Charter Extension 29 May 2012 30 Sep 2012 none
Rechartered 24 Oct 2012 31 May 2015

Investigation of improved font compression schemes for WOFF, and a new Recommendation-track deliverable, WOFF 2.0

Charter Extension 8 Apr 2015 31 May 2017 none
Charter Extension 10 Jul 2017 31 Aug 2017 none
Charter Extension 11 Jan 2018 30 Apr 2018 none
Rechartered 13 Dec 2018 13 Sept 2022 Investigation of progressive font enrichment options, and a new Recommendation-track deliverable for the chosen solution.
2020-11-10: Garret Rieger (Google) appointed as group co-chair.
Rechartered 15 December 2020 13 September 2022 New Patent Policy.
2021-01-28: Vladimir Levantovsky (W3C Invited Experts) re-appointed as group co-chair
Extended 21 November 2022 15 March 2023 none
Rechartered 28 March 2023 28 March 2025 Update to latest charter template.
This draft charter [dd monthname yyyy] (date of the "Call for Participation", when the charter is approved) [dd monthname yyyy] (Start date + 2 years) Single IFT specification, range request dropped. Update to latest charter template.

Change log

Changes to this document are documented in this section.