] displays as boxes but maintains tag to guide the interpretation of boxes on input.
TagBox provides a way to store hidden information in Mathematica output.
TagBox is generated sometimes in StandardForm output, and often in TraditionalForm output.
By convention, tag is typically a symbol that corresponds to the head of the interpreted form of boxes.
The following options can be given:
If you modify the displayed form of TagBox[
] only boxes will be modified, and there is no guarantee that correct correspondence with expr will be maintained.
See the Mathematica book: Section 2.8.10.
See also: InterpretationBox, FormBox, ToExpression.
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