Socialwg/Webmention CR Transition Request

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To: the group (optionally), the acting Director, the domain lead, W3C Comm Team <>, "" <>

Archived at:

Transition Request

This is a transition request to Candidate Recommendation.

Document title, URIs, and estimated publication date

The document Abstract and Status sections


  • 'Webmention is a simple way to notify any URL when you link to it on your site. From the receiver's perspective, it's a way to request notifications when other sites link to it.'


Decision to request transition


Confirming slightly reworking normative references:



Requirements satisfied

No requirements document.

Dependencies met (or not)

A few notes:

  • References to WHATWG's Fetch is not normatively different from existing IETF specs defining HTTP redirection
  • References to h-entry are for illustration only

Wide Review

Webmention was first developed in the IndieWebCamp community. Its page there lists independent implementations, reported by the implementors. These implementations act as implicit reviews, and still largely apply since the changes have been to clarify edge cases and are intended to be entirely backward compatible.

Since coming to W3C, 30 issues on github have been opened (by ten different people, not counting the editor) and addressed, all closed by 2016-04-15.

2016-05-03 Announcement and request for comments on W3C public-review-announce list.

Issues addressed

See issue tags and history

Formal Objections



The twenty-seven (!!) earlier indiewebcamp implementations stand largely in support of the current spec, and have been tested in an ad hoc manner with each other. Now that the spec is more formal, has a test suite (and minor additions), we are gathering new implementation reports with test results.

Patent disclosures


News Item

Webmention Helps Re-Decentralize the Web

The W3C Social Web Working Group is calling for implementations of Webmention, which is now a Candidate Recommendation. Webmention provides a mechanism for a website to notify other websites that it has content which links to them and when the source content changes or is deleted. This mechanism is a core building block for a decentralized (social) Web, because it allows sites to automatically learn about connected content, without any prior setup or agreement. For users, an immediate benefit is cross-site comments. Before being brought to W3C for standardization, Webmention already had twenty-seven independent implementations in the IndieWebCamp community.