-moz-inline-box vs -moz-inline-stack

What's the difference between Firefox's -moz-inline-开发者_如何学Pythonbox and -moz-inline-stack proprietary display values?

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https://developer.mozilla.org/en/CSS/display

-moz-inline-box ~ (no detail given)

-moz-inline-stack ~ Child elements, including inline-block, block, and -moz-inline-stack are laid out atop one another.