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a dialog box is a type of window used to enable a "dialog" between a computer and its user.

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There is not really a "UX" reason for this—or if there is, it is a very limited one. The actual reason why dialog backgrounds are (by default) some shade of grey is because some designers thought … that looked better. In many early operating systems, dialog and window backgrounds were stark white. Obviously they were white on the original Mac OS, since it had only a one-bit black-and-white display …
answered Jun 14 '16 by Cody Gray