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onmouseover Event mouseover Javascript DOM Tutorial

The mouseover event fires when the mouse pointer enters the boundaries of the target object. This is commonly used to create mouse RollOver effects in which the user's mouse hovers over an object(onmouseover) it changes appearance, then when the user's mouse leaves the object(onmouseout) it returns to its normal appearance.

SYNTAX // Javascript
element.onmouseover = jsFunction;
<element onmouseover="jsFunction();"></element>


Scripting mouseover events through Javascript and the DOM:

<script type="text/javascript">
function addEventsToHTML(){
    var div1 = document.getElementById('div1');
    div1.onmouseover = doStuff;
    function doStuff(){ = "#F00";
window.onload = addEventsToHTML;
<div id="div1" style="background:#999;">Mouse over me</div>

Establishing mouseover events direct on the html elements:

<script type="text/javascript">
function doStuff(target){ = "#F00";
<div onmouseover="doStuff(this);" style="background:#999;">Mouse over me</div>
Mouse over me
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CSS Level 3 Properties is a growing educational system packed with video and written material that you can access 24/7 100% free. The focus here in 2014 is spread between five technologies: HTML, CSS, JavaScript, PHP and MySQL. Learn programming theory, database interaction, web design, animation, graphics editing, vector art, 3D modeling, and much more. The educational experience here is a hybrid one offering both high quality video tutorials and code libraries that grow more robust every day. The code libraries are being assembled so that developers can discover all of the building blocks of their favorite languages. The libraries coupled with high quality video tutorials will take you deep down the rabbit hole very quickly. You can also ask questions and get free advice at