[1] User Timing ( ( 版)) <http://dvcs.w3.org/hg/webperf/raw-file/default/specs/UserTiming/Overview.html>
[7] User Timing Level 2 () <https://www.w3.org/TR/2016/WD-user-timing-2-20161101/>
[8] Call for Exclusions: User Timing Level 2 (Xueyuan Jia著, ) <https://lists.w3.org/Archives/Public/public-web-perf/2016Nov/0001.html>
[9] Wide Review for User Timing 2 (Philippe Le Hégaret著, ) <https://lists.w3.org/Archives/Public/public-web-perf/2016Nov/0003.html>
[10] Call for Exclusions (Updates): High Resolution Time Level 3; User Timing Level 2; Resource Timing Level 2 (Coralie Mercier著, ) <https://lists.w3.org/Archives/Public/public-web-perf/2017Feb/0001.html>
[11] Align with w3c/hr-time#47 (plehegar著, ) <https://github.com/w3c/user-timing/commit/a57461b48de553910478a74ee0d2225c9a734b69>
[12] User Timing Level 2 () <https://www.w3.org/TR/2017/WD-user-timing-2-20171206/>
[13] User Timing Level 2 () <https://www.w3.org/TR/2017/WD-user-timing-2-20171207/>
[14] User Timing Level 2 () <https://www.w3.org/TR/2018/WD-user-timing-2-20180706/>
[15] User Timing Level 2 () <https://www.w3.org/TR/2018/WD-user-timing-2-20180709/>
[16] User Timing Level 2 () <https://www.w3.org/TR/2018/CR-user-timing-2-20180709/>
[17] Call for Exclusions: User Timing Level 2 (Xueyuan著, ) <https://lists.w3.org/Archives/Public/public-web-perf/2018Jul/0003.html>