Isn't it a bit ridiculous that we need to do this in the first place? Shouldn't clear 3D controls on a neutral gray background be the default user-agent appearance, with no need for custom CSS of any sort?
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So what remains is either black or white. White seems to be a more rational pick.
If you, the author of the page decide to respect it then it's fine, but I'd be a bit mad if the browser decided to override my page design to an arbitrary grey shade if I don't declare a background color for the body.