1.2.1 Normative References

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[CSS3UI:2018] Çelik, T. and Rivoal, F., Eds., "CSS Basic User Interface Module Level 3 (CSS3 UI)", W3C Recommendation, June 2018, https://www.w3.org/TR/2018/REC-css-ui-3-20180621/

[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