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

Details and Options


open allclose all

Basic Examples  (1)

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

Scope  (4)

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:

Options  (6)

Alignment  (1)

Align within Mouseover:

Background  (1)

Change the background color:

BaselinePosition  (1)

Align with surrounding text:

FrameMargins  (1)

Add margins to Mouseover:

ImageMargins  (1)

Add margins to Mouseover:

ImageSize  (1)

Control the overall size of Mouseover:

Applications  (1)

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

Properties & Relations  (1)

Mouseover changes the expression itself:

StatusArea presents the label in the status area:

Tooltip presents the label in a popup box:

Possible Issues  (1)

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:

Neat Examples  (1)

Wolfram Research (2007), Mouseover, Wolfram Language function,


Wolfram Research (2007), Mouseover, Wolfram Language function,


@misc{reference.wolfram_2020_mouseover, author="Wolfram Research", title="{Mouseover}", year="2007", howpublished="\url{}", note=[Accessed: 28-February-2021 ]}


@online{reference.wolfram_2020_mouseover, organization={Wolfram Research}, title={Mouseover}, year={2007}, url={}, note=[Accessed: 28-February-2021 ]}


Wolfram Language. 2007. "Mouseover." Wolfram Language & System Documentation Center. Wolfram Research.


Wolfram Language. (2007). Mouseover. Wolfram Language & System Documentation Center. Retrieved from