[1] Safari Dev Center: Safari HTML Reference: Supported Input Values ( 版) <http://developer.apple.com/safari/library/documentation/AppleApplications/Reference/SafariHTMLRef/Articles/InputTypes.html#//apple_ref/doc/uid/TP40008055-SW4>
[2] [whatwg] Changing punctuation value of input element in telephone state ( 版) <http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2010-July/027404.html>
[3] Opera: Opera 11.00 for Windows changelog ( (Frank M. Palinkas, Technical Writer, Opera Software ASA 著, 版)) <http://www.opera.com/docs/changelogs/windows/1100/>