[1] [CITE[ドラッグによるテキストの選択をキャンセルする【CSS, HTML, JavaScript】 - Programming Magic]]
( ([TIME[2010-12-26 18:53:25 +09:00]] 版))
<http://www.programming-magic.com/20071217225449/>

[2] [CITE[User Interface Enhancements]]
( ([TIME[1999-09-16 05:07:02 +09:00]] 版))
<http://www.w3.org/TR/1999/WD-css3-userint-19990916#user-select>

[3] [CITE@en[User Interface for CSS3]]
( ([TIME[2000-06-23 03:09:21 +09:00]] 版))
<http://www.w3.org/TR/2000/WD-css3-userint-20000216#user-select>

[4] [CITE@en[Specifying selectable text (Windows)]]
( ([TIME[2013-11-13 13:47:53 +09:00]] 版))
<http://msdn.microsoft.com/en-us/library/ie/hh708742(v=vs.85).aspx>