CORE ATTRIBUTE:  onmouseover
onmouseover="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 onmouseover core attribute is an event handler that is associated with moving the mouse over a selected HTML tag (element). In other words, the mouse over event occurred while the HTML element was in focus. Every time you move the mouse over the element, the script code of the onmouseover 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, onmouseout, and onmouseup.
 
In this example, simply move the mouse over on the button element. As soon as you move over, an alert is displayed with a message.
 
Code:
<input type="button" onmouseover="JavaScript: alert( 'onmouseover event' )" value="Move The Mouse Over This Button!">
 
Output:

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