<!--
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<!DOCTYPE html>
<html>
<head>
<title>CSS Filters: Apply Opacity to an HTML Element Using a Factor of Zero</title>
<link rel="author" title="Max Vujovic" href="mailto:mvujovic@adobe.com">
<link rel="help" href="http://www.w3.org/TR/filter-effects-1/#funcdef-opacity">
<link rel="match" href="opacity-zero-ref.html">
<meta name="assert"
content="Given a factor of zero, the CSS opacity filter function should
make an HTML element completely transparent.">
<style type="text/css">
#below-target {
background-color: #0f0;
width: 100px;
height: 100px;
}
#target {
filter: opacity(0);
background-color: #f00;
position: relative;
top: -100px;
width: 100px;
height: 100px;
}
</style>
</head>
<body>
<p>You should see a green square.</p>
<div id="below-target"></div>
<div id="target"></div>
</body>
</html>