[Fixing the garbled text, apologies.]

The document defines a new JMAP capability for JMAP servers to advertise
the key they can use to authenticate WebPush notifications using VAPID.

It is short and very clear.

It is ready for publication modulo a couple of easily fixable issues:

1. "The P-256 public key [...] encoded in URL-safe base64 [...]"

The format of the P-256 public key should be better specified.

Is https://www.rfc-editor.org/rfc/rfc8292.html#section-3.2 what it's
used for?  If so, reference the section, or extract the relevant bits
(e.g., "ECDSA public key [FIPS186] in uncompressed form [X9.62] that is
encoded using base64url encoding [RFC7515].”)

2. The registration template has a Security Consideration field which is
missing from the request.

Nits:

* that is compatible [-to-]{+with+} WebPush

* To [-faciliate that-]{+facilitate that,+} the client

* MUST authenticate [-that-]{+the+} POST request

* advertised in the [-capabilites-]{+capabilities+} object

* the sessionState [-in accordance with-]{+per+} [RFC8620].

* contain an updated sessionState, [-that-]{+which+} refers to

* This specification requests IANA to register {+a new capability in+}
  the JMAP [-Capability for VAPID-]{+Capabilities registry
  {{?IANA.jmap}}+} with the following data: