[1] [CITE@en[Performance Timeline]]
( ([TIME[2012-05-08 00:01:06 +09:00]] 版))
<http://www.w3.org/TR/2012/WD-performance-timeline-20120508/>

[2] [CITE@en[Performance Timeline]]
( ([TIME[2012-07-21 04:14:58 +09:00]] 版))
<http://www.w3.org/TR/2012/CR-performance-timeline-20120726/>