We've reached our VR Complete milestone!

Hey everyone!

The last PRs for the "June" (ha ha) milestone were merged at the beginning
of this week. This means that, according to our project doc
<https://github.com/immersive-web/administrivia/blob/master/project.md> *we've
now hit "VR Complete!"*

[Celebratory image removed to appease the mailserver's attachment size
limits]

Congratulations to the entire Working Group for reaching this important
milestone, and our sincerest thanks to everyone who has contributed to the
spec in ways big and small! This has truly been a community effort.

So what exactly does "VR complete" mean and what happens next? At this
point the portions of the API dealing with core VR functionality
(essentially: anything needed to replace WebVR) are "locked in". Unless we
encounter major issues affecting the API's usability or security from this
point forward we will be doing everything we can to avoid breaking
backwards compatibility. We want browser vendors to feel secure in
implementing the API and developers to feel confident that they can start
creating content with it without the rug being pulled out from under them,
and that starts *today!*

That doesn't mean we're done, of course! There's still plenty of room for
improvement in the spec, and we expect that we'll continue to tweak the
behavior under the hood in ways that don't have major impact on
applications using it for the sake of consistency, security, and clarity.
There will be plenty of work to keep us busy right up through TPAC and
beyond!

Also, please note that in the current editors draft
<https://immersive-web.github.io/webxr/> there are a couple of sections
still marked "unstable", specifically the "immersive-ar" mode and the
"XRRay" interface. These are *not* considered to be part of the VR complete
stability milestone, since they are AR-focused. We will be breaking those
out into a separate module over the next couple of weeks to allow work to
continue on them in parallel while we finish up the "core" spec. Also, for
the sake of avoiding confusion we'll be waiting until the modules split has
been completed to cut the next Working Draft.

Thank you again for everyone's support!

--The Immersive Web Leadership Team