] displays with a frame drawn around box.
In StandardForm and InputForm, FrameBox is by default ignored, so that FrameBox[
] 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.
See the Mathematica book: Section 2.8.10.
See also: StyleBox, CellFrame, ColumnLines, RowLines.
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