[REFS[
- [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#at-rule-preference>
- [1] [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#at-rule-preference>
]REFS]