Details

FrameBox is generated as the low-level representation of Framed. Except for low-level notebook expression manipulation, FrameBox should not need to be used directly.
The following options can be given:

Background	Automatic	background color
BaselinePosition	Automatic	alignment relative to surrounding text
BaseStyle	{}	base style specifications for the frame
ContentPadding	True	whether to shrink the margins tightly around the contents
FrameMargins	Automatic	margins to leave inside the frame
FrameStyle	{}	graphics directives giving a style for the frame
ImageMargins	0.	margins around the image of the displayed frame
ImageSize	Automatic	the overall image size of the displayed frame
RoundingRadius	{0.,0.}	radius for rounded corners

In StandardForm and InputForm, FrameBox is by default ignored, so that FrameBox[box] is interpreted just as box would be.
In StandardForm, explicit FrameBox objects are output literally. You can use DisplayForm to see the display form of such objects.

Examples

Display a framed expression:

Wolfram Language code: FrameBox["abcd"]//DisplayForm

Display frames around multiple parts of a typeset structure:

Wolfram Language code: FrameBox[SubscriptBox[FrameBox["x"], FrameBox["0"]]]//DisplayForm

You can use Framed to produce the same structure:

Wolfram Language code: Framed[Subscript[Framed[x], Framed[0]]]

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