[4] Motion Path Module Level 1 ( (2015-04-09 01:07:41 +09:00 版)) http://www.w3.org/TR/2015/WD-motion-1-20150409/
[1] Republishing CSS Motion Path (Eric Willigers著, 2017-07-03 07:56:43 +09:00) https://lists.w3.org/Archives/Public/www-style/2017Jul/0000.html