[1] Navigation Timing ( (12/12/2012, 9:51:35 PM 版)) <http://www.w3.org/TR/2012/REC-navigation-timing-20121217/#sec-navigation-timing-interface>
[2] mark performance.timing as obsolete (igrigorik著, 2/24/2017, 8:48:47 PM) <https://github.com/w3c/navigation-timing/commit/b9eee3958b66d268f06166b3887c51de1c7de627>
Google search: PerformanceTiming