CORE ATTRIBUTE:  onmouseout
onmouseout="action"
Available in versions: 4.0
HTML 4.0 tag compatibility: All tags except applet, base, basefront, bdo, br, font, frame, frameset, head, html, iframe, isindex, meta, param, script, style, title
 
The onmouseout core attribute is an event handler that is associated with moving the mouse out of a selected HTML tag (element). In other words, the mouse out event occurred while the HTML element was in focus. Every time you move the mouse out of the element, the script code of the onmouseout is executed. This script can also call functions or subroutines which contain code that you want to run when this event occurs.
 
The four other similar core attributes are: onmousedown, onmousemove, onmouseover, and onmouseup.
 
In this example, simply place the mouse inside the button element and then move it out. As soon as you move out, an alert appears with a message.
 
Code:
<input type="button" onmouseout="JavaScript: alert( 'onmouseout event' )" value="Move The Mouse Out Of This Button!">
 
Output:

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