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

[UserTiming:2013] Mann, J., Wang, Z. and Quach, A., Eds., "User Timing", W3C Recommendation, December 2013, https://www.w3.org/TR/2013/REC-user-timing-20131212/