[1] Touching and Gesturing on the iPhone | SitePen Blog (2010-12-12 14:10:33 +09:00 版) <http://www.sitepen.com/blog/2008/07/10/touching-and-gesturing-on-the-iphone/>

[2] Touch Events ( (2013-10-12 10:35:42 +09:00 版)) <https://dvcs.w3.org/hg/webevents/raw-file/v1/touchevents.html#event-touchstart>

[3] Added ontouch* event handler attributes · w3c/touch-events@71947f0 (2015-10-27 12:59:04 +09:00 版) <https://github.com/w3c/touch-events/commit/71947f06bf3394bb954cc8819a072e2ef925bff6>