onmouseout (HTML attribute)

Depr. Version
Browser support (more…)
IE5.5+ FF1+ SA1.3+ OP9.2+
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The onmouseout attribute is the “partner” attribute to the commonly used onmouseover attribute. It captures the moment that a mouse pointer crosses the boundary of an element, moving from the inside to the outside of the element to which the attribute is applied.

onmouseout is mostly used for resetting a visual effect that was previously applied by the onmouseover attribute—for example, reinstating the default state of an image that was swapped for a new image.

Note that this event attribute cannot be applied to the following elements:

  • applet
  • base
  • basefont
  • bdo
  • br
  • font
  • frame
  • frameset
  • head
  • html
  • iframe
  • isindex
  • meta
  • param
  • script
  • style
  • title


The example below shows a simple image swap technique, whereby moving the mouse away from the image causes the original image to be reinstated:

  <img src="map.gif" alt="Hover to reveal the location on the map"
      onmouseout="this.src='map.gif';"/>Figures for February’s racing.


This attribute has no fixed value. It’s up to the author to decide on the scripting that’s included here, be that a call to one or more defined functions, or a simple alert() statement.


Internet Explorer Firefox Safari Opera
5.5 6.0 7.0 1.0 1.5 2.0 1.3 2.0 3.0 9.2 9.5
Full Full Full Full Full Full Full Full Full Full Full

Every browser listed supports this attribute. However, inline event handlers such as this should be avoided. In the same way that inline CSS styles are frowned upon but externally defined CSS styles are considered good practice, inline event handlers should be stripped out and replaced with events attached unobtrusively through the DOM.

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