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Specification: http://www.whatwg.org/specs/web-apps/current-work/multipage/rendering.html Multipage: http://www.whatwg.org/C#the-select-element-0 Complete: http://www.whatwg.org/c#the-select-element-0 Comment: <select> needs to have border-box sizing by default Posted from: 173.48.81.109 by bzbarsky@mit.edu User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:19.0) Gecko/19.0 Firefox/19.0
This seems to be interoperably implemented by Gecko/Presto/WebKit, and I know Gecko initially cribbed it from IE standards mode...
This got fixed in response to some other feedback you sent (by e-mail, I think).