On Wednesday, April 8, 2015 at 8:03:45 PM UTC-4, L. David Baron wrote:

> This is a specification that's the W3C version of a piece of the
> WHATWG HTML specification.  It appears (from looking at code) to be
> something we implement, although I'm not sure if there are
> differences between the W3C and WHATWG versions, and I don't know
> anything about the status of our implementation.

In WebApps' Call for Consensus to publish the Web Messaging Proposed 
Recommendation I mentioned the status of this spec vis-a-vis the WHATWG version:

[[
<https://lists.w3.org/Archives/Public/public-webapps/2015JanMar/0848.html>

Cindy created a Draft PR [PR] that includes Hixie's updates since the 
[CR] was published (but not the PortCollection interface [PC] which is 
not broadly implemented). Overall, we consider the changes since the CR 
as non-substantive bug fixes and clarifications that align the spec with 
current implementations, and that the test suite tests the updated spec. 
See [Diff] for all of changes between the CR and the draft PR and note 
the draft PR's status section includes a short summary of the changes.

[PR] <http://www.w3.org/TR/2015/PR-webmessaging-20150407/>
[CR] <http://www.w3.org/TR/2012/CR-webmessaging-20120501/>
[PC] <http://dev.w3.org/html5/postmsg/#broadcasting-to-many-ports>
[Diff] <https://www.diffchecker.com/qswiibb5>
]]

Regarding the Firefox implementation of this spec, Firefox is included in the 
Implementation Report 
<http://w3c.github.io/test-results/webmessaging/all.html>, and generally 
speaking does very well.

-HTH, ArtB
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