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Mathematica > Viewers and Annotation >

Built-in Mathematica Symbol

Mouseover

Mouseover[expr, over]
represents an object that displays as over when the mouse pointer is over it, and as expr otherwise.

	Alignment	{Left,Top}	how to align objects in the display area
	ImageSize	Automatic	the overall image size for the displayed objects

With the default option setting ImageSize->Automatic, Mouseover leaves space only for the object currently being displayed.

With the option setting ImageSize->All, Mouseover leaves enough space for either expr or over.

Change from off to on when the mouse is over the expression:

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