Try it Yourself

<!DOCTYPE html>
<html>
<head>
<style>
img {
    opacity: 0.5;
    filter: alpha(opacity=50); /* For IE8 and earlier */
}

img:hover {
    opacity: 1.0;
    filter: alpha(opacity=100); /* For IE8 and earlier */
}
</style>
</head>
<body>

<h1>Image Transparency</h1>
<p>The opacity property is often used together with the :hover selector to change the opacity on mouse-over:</p>
<img src="img_forest.jpg" alt="Forest" width="170" height="100">
<img src="img_mountains.jpg" alt="Mountains" width="170" height="100">
<img src="img_fjords.jpg" alt="Fjords" width="170" height="100">

<p><b>Note:</b> In IE, a !DOCTYPE must be added for the :hover selector to work on other elements than the a element.</p>

</body>
</html>
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