clientX 属性、 clientY 属性 (MouseEvent オブジェクト)

[1] WinIE7, WebKit, Gecko, Opera が実装しています。

[2] event.clientX - MDC (2009-01-12 21:51:54 +09:00 版) <https://developer.mozilla.org/En/DOM/Event.clientX>

[3] Document Object Model Events (2000-11-10 08:17:19 +09:00 版) <http://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-MouseEvent-clientX>

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