1.2.1 Normative References

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[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997, http://www.rfc-editor.org/rfc/rfc2119.txt

[W3C-HTML5WEBMSG] World Wide Web Consortium, "HTML5 Web Messaging", W3C Recommendation 19 May 2015, http://www.w3.org/TR/2015/REC-webmessaging-20150519/