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

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