Summary: Ready with editorial nits.

Major issues: none

Minor Issues: Editorials

o The document does not pass IDnits.

  ** Downref: Normative reference to an Informational RFC: RFC 2818

   This is obviously intentional but I did not see any mention of this e.g., in the proto write-up.

  -- Obsolete informational reference (is this intentional?): RFC 5988
   This should obviously be 8288 as it obsoletes 5988.

o line 256	   s/clients SHOULD not/clients SHOULD NOT
o line 146	   s/The origin frame/The ORIGIN frame
o line 429    What does "case-normalization" mean? I could not immediately find that expression, at least not in the referenced RFC6454. If it means making the ORIGIN header values lower case, just state that.