BUILT-IN MATHEMATICA SYMBOL

Mouseover

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

to

when the mouse is over the expression:

Change from

to

when the mouse is over the expression:

Out[1]=

Use anywhere in a formula:

Use anywhere in a graphic:

ImageSize->All keeps the overall size constant regardless of which expression is visible:

Use Dynamic to recompute the tooltip every time it is looked at:

Align within Mouseover:

Change the background color:

Align with surrounding text:

Add margins to Mouseover:

Control the overall size of Mouseover:

Use Mouseover to find the rule number of a particular CellularAutomaton:

Mouseover changes the expression itself:

StatusArea presents the label in the status area:

Tooltip presents the label in a popup box:

If the mouseover is smaller than the original object, there can be an oscillation:

With ImageSize->All space is always left for the largest object: