Where should that dang button go?

So, here we have the Aqua Human Interface Guidelines (i.e. the MacOS-X user interface guidelines), the GNOME Human Interface Guidelines, the KDE User Interface Guidelines and of course the Microsoft Windows Official Guidelines for User Interface Developers and Designers (I came back in January of 2018 to fix this link — also interesting is the section on margins and spacing).

Apple says that “The default button for dismissing a dialog should go in the lower-right corner. If there’s a Cancel button, it should be to the left of the default button.”. Gnome seems to imply that the default button should be on the bottom right, with other buttons to its left, which is more or less consistent with the Apple guidelines.

Microsoft says: “Lay out the major command buttons either stacked along the upper right border of the dialog box or lined up across the bottom of the dialog box. Position the most important button — typically the default command — as the first button in the set.” The KDE User Interface Guidelines don’t seem to set specific constraints on this kind of button placement, but judging by many of the standard KDE 3.1 applications, the dialogs seem to follow the Windows convention.
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