1.2.1 Normative References

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[NavigationTiming] World Wide Web Consortium, "Navigation Timing", W3C Recommendation 17 December 2012, http://www.w3.org/TR/2012/REC-navigation-timing-20121217/

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