mozilla/browserid — Issue #809: UX with regards to button capitalization
Author: lookfirst
Created: 2011-12-26 05:01:10+00:00
State: open

Not a definitive source, but it seems that the Apple UX guidelines suggest that you use "Use title-style capitalization for the button title and add an ellipsis if necessary. "

http://developer.apple.com/library/mac/#documentation/UserExperience/Conceptual/AppleHIGuidelines/Controls/Controls.html#//apple_ref/doc/uid/TP30000359-TPXREF186

Here is the Windows take on it (Use sentence-style capitalization):

http://msdn.microsoft.com/en-us/library/windows/desktop/aa511453.aspx

I'd appreciate it if you decide to close this issue with 'as designed', that you explain why you choose to not follow platform UX guidelines.