[1] User Interface Enhancements ( (9/15/1999, 8:07:02 PM 版)) <http://www.w3.org/TR/1999/WD-css3-userint-19990916#user-input>
[2] User Interface for CSS3 ( (6/22/2000, 6:09:21 PM 版)) <http://www.w3.org/TR/2000/WD-css3-userint-20000216#user-input>
Google search: user-input