Specification

https://www.w3.org/TR/2026/WD-webtransport-20260325/

Explainer

https://github.com/w3c/webtransport/blob/main/explainer.md

Links

• The WG's request for this TAG review: https://github.com/w3c/webtransport/issues/741
• TAG review of the previous version of this specification, if any: https://github.com/w3ctag/design-reviews/issues/669
• A description of what has changed since our previous review: Summary of Changes along with a diff

The specification

• Follows the Web Platform Design Principles.
• Includes Security and Privacy Considerations sections based on answers to the Security/Privacy Questionnaire.

Where and by whom is the work is being done?

• GitHub repo: https://github.com/w3c/webtransport
• Primary contacts:
  • Victor Vasiliev @vasilvv Google Editor
  • Nidhi Jaju @nidhijaju Google Editor
  • Jan-Ivar Bruaroey @jan-ivar Mozilla Editor
  • Will Law @wilaw Akamai co-chair
  • Jan-Ivar Bruaroey @jan-ivar Mozilla co-chair
  • Yves Lafon @ylafon W3C Staff Contact
• Organization/project driving the specification: W3C
• This work is being funded by: Google, Mozilla, Apple, Akamai through workgroup participation.
• Primary standards group developing this feature: WebTransport Working Group
• Incubation and standards groups that have discussed the design:
  • WHATWG Fetch https://github.com/whatwg/fetch/issues?q=is%3Aissue%20webtransport%20state%3Aclosed
  • WHATWG Streams https://github.com/whatwg/streams/issues?q=is%3Aissue%20state%3Aclosed%20webtransport
  • W3C WebAppSec-CSP https://github.com/w3c/webappsec-csp/issues?q=is%3Aissue%20webtransport

Feedback so far

• Active horizontal reviews: https://github.com/w3c/webtransport/issues/741
• Multi-stakeholder feedback:
  • Chromium comments: Intent to Ship: WebTransport Application Protocol Negotiation
  • Mozilla comments: https://github.com/mozilla/standards-positions/issues/167
  • WebKit comments: https://github.com/WebKit/standards-positions/issues/18
• Major unresolved issues with or opposition to this specification: None
• Status/issue trackers for implementations:
  • Chrome Status (shipped) https://chromestatus.com/feature/4854144902889472
  • Mozilla's (shipped) https://bugzilla.mozilla.org/show_bug.cgi?id=1709355
  • WebKit's Bugzilla (shipped) https://bugs.webkit.org/show_bug.cgi?id=297534 and Safari release note

You should also know that...

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