Web Performance Working Group - IPR

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

Adobe
Airbnb Inc
Akamai Technologies
Alibaba Group
Amazon
Apple Inc.
Baidu, Inc.
British Broadcasting Corporation
ByteDance
Cloudflare
Fastly
Google LLC
Igalia
Meta
Microsoft Corporation
MITRE Corporation
Mozilla Foundation
Rakuten Group, Inc.
Salesforce
Shopify
Skynet Technologies
The New York Times
Wikimedia Foundation
Wix.com Ltd.

Note: Log in to see links to organizations if you have member access

Invited Experts

Abin Paul
Peter Perlepes
Dan Shappir
Michelle Vu
Giacomo Zecchini

Team members

Carine Bournez

See also the list of individuals participating in this group.

The Call for Participation for this group was announced on 2021-02-11; 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 Web Performance Working Group that have associated disclosures obligations, and possible licensing obligations under the W3C Patent Policy.

Document under the W3C Patent Policy	Patent Disclosure	Patent Exclusion
Navigation Timing	disclose	exclude
Page Visibility (Second Edition)	disclose	exclude
Performance Timeline	disclose	exclude
Resource Timing	disclose	exclude
User Timing Level 3	disclose	exclude
High Resolution Time	disclose	exclude
Navigation Timing Level 2	disclose	exclude
Beacon	disclose	exclude
High Resolution Time Level 2	disclose	exclude
Network Error Logging	disclose	exclude
Resource Hints	disclose	exclude
Server Timing	disclose	exclude
Performance Timeline	disclose	exclude
Preload	disclose	exclude
requestIdleCallback() Cooperative Scheduling of Background Tasks	disclose	exclude
Reporting API	disclose	exclude
Page Visibility Level 2	disclose	exclude
User Timing Level 2	disclose	exclude
High Resolution Time	disclose	exclude
Resource Timing	disclose	exclude
Long Tasks API 1	disclose	exclude
Paint Timing 1	disclose	exclude
Device Memory	disclose	exclude
User Timing	disclose	exclude
Event Timing API	disclose	exclude
Largest Contentful Paint	disclose	exclude

Document not/no longer under the W3C Patent Policy	Patent Disclosure	Patent Exclusion
Timing control for script-based animations	disclose	Exclusion is not possible (document not under PP)
Resource Priorities	disclose	Exclusion is not possible (document not under PP)
Frame Timing	disclose	Exclusion is not possible (document not under PP)
Timing Entry Names Registry	disclose	Exclusion is not possible (document not under PP)

Patent Disclosures and Claim Exclusions

This section summarizes patent disclosures by participants in W3C's Web Performance 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

No patent disclosures have been made for any specifications of this group.

How to Make a Patent Disclosure

W3C Members and Invited Experts (including those not participating in this group) wishing to disclose a patent for any specification produced by the Web Performance Working Group should use the Web Performance Working Group patent disclosure form.

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 Web Performance 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 Web Performance Working Group patent claim exclusion form, but only after first disclosing the patent.

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

No current exclusion opportunities

View previous exclusion opportunities

Resource Timing: Call for exclusion started on 2022-10-04, opportunity until 2022-12-03
Largest Contentful Paint: Call for exclusion started on 2022-05-24, opportunity until 2022-10-21
Event Timing API: Call for exclusion started on 2022-05-24, opportunity until 2022-10-21
User Timing: Call for exclusion started on 2021-12-02, opportunity until 2022-01-31
Performance Timeline: Call for exclusion started on 2021-12-02, opportunity until 2022-01-31
Page Visibility Level 2: Call for exclusion started on 2021-05-18, opportunity until 2021-07-17
High Resolution Time: Call for exclusion started on 2020-10-01, opportunity until 2021-02-28
User Timing Level 3: Call for exclusion started on 2019-03-05, opportunity until 2019-08-02
Device Memory: Call for exclusion started on 2018-09-25, opportunity until 2019-02-22
User Timing Level 2: Call for exclusion started on 2018-07-10, opportunity until 2018-09-08
High Resolution Time Level 2: Call for exclusion started on 2018-03-01, opportunity until 2018-04-30
Long Tasks API 1: Call for exclusion started on 2017-09-07, opportunity until 2018-02-04
Paint Timing 1: Call for exclusion started on 2017-09-07, opportunity until 2018-02-04
Preload: Call for exclusion started on 2017-10-26, opportunity until 2017-12-25
High Resolution Time Level 2: Call for exclusion started on 2017-08-03, opportunity until 2017-10-02
Beacon: Call for exclusion started on 2017-04-13, opportunity until 2017-06-12
Resource Timing Level 1: Call for exclusion started on 2017-03-30, opportunity until 2017-05-29
Page Visibility Level 2: Call for exclusion started on 2017-03-29, opportunity until 2017-05-28
Cooperative Scheduling of Background Tasks: Call for exclusion started on 2017-02-02, opportunity until 2017-04-03
Resource Timing Level 2: Call for exclusion started on 2016-11-03, opportunity until 2017-04-02
User Timing Level 2: Call for exclusion started on 2016-11-01, opportunity until 2017-03-31
High Resolution Time Level 3: Call for exclusion started on 2016-11-01, opportunity until 2017-03-31
Performance Timeline Level 2: Call for exclusion started on 2016-12-08, opportunity until 2017-02-06
Page Visibility Level 2: Call for exclusion started on 2016-11-22, opportunity until 2017-01-21
High Resolution Time Level 2: Call for exclusion started on 2016-11-01, opportunity until 2016-12-31
Page Visibility 2: Call for exclusion started on 2016-06-23, opportunity until 2016-11-20
Resource Timing Level 1: Call for exclusion started on 2016-07-21, opportunity until 2016-09-19
Reporting API 1: Call for exclusion started on 2016-04-07, opportunity until 2016-09-04
Cooperative Scheduling of Background Tasks: Call for exclusion started on 2015-09-17, opportunity until 2016-02-14
Preload: Call for exclusion started on 2015-07-22, opportunity until 2015-12-18
Performance Timeline Level 2: Call for exclusion started on 2015-07-17, opportunity until 2015-12-13
Server Timing: Call for exclusion started on 2015-02-17, opportunity until 2015-07-17
Frame Timing: Call for exclusion started on 2015-01-20, opportunity until 2015-06-19
Resource Hints: Call for exclusion started on 2014-10-23, opportunity until 2015-03-22
Beacon: Call for exclusion started on 2014-06-24, opportunity until 2014-08-23
Navigation Error Logging: Call for exclusion started on 2014-02-12, opportunity until 2014-07-12
High Resolution Time Level 2: Call for exclusion started on 2013-12-03, opportunity until 2014-05-02
Resource Priorities: Call for exclusion started on 2013-10-29, opportunity until 2014-03-28
Beacon: Call for exclusion started on 2013-10-29, opportunity until 2014-03-28
Navigation Timing 2: Call for exclusion started on 2013-01-31, opportunity until 2013-06-30
User Timing: Call for exclusion started on 2012-05-08, opportunity until 2012-07-07
Performance Timeline: Call for exclusion started on 2012-05-08, opportunity until 2012-07-07
Timing control for script-based animations: Call for exclusion started on 2012-03-12, opportunity until 2012-05-11
Resource Timing: Call for exclusion started on 2011-09-12, opportunity until 2011-11-11
Page Visibility: Call for exclusion started on 2011-09-12, opportunity until 2011-11-11
Timing control for script-based animations: Call for exclusion started on 2011-06-02, opportunity until 2011-10-30
Page Visibility: Call for exclusion started on 2011-06-02, opportunity until 2011-10-30
Resource Timing: Call for exclusion started on 2011-05-24, opportunity until 2011-10-21
Navigation Timing: Call for exclusion started on 2011-01-11, opportunity until 2011-03-12

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.