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<!DOCTYPE html>
<html>
<head>
<style type="text/css">
div {
background-color: white;
position: absolute;
margin: 0px;
padding: 0px;
width: 100px;
height: 100px;
top: 10px;
}
div.auto {
left: 10px;
background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%"><rect x="0" y="0" width="100%" height="100%" fill="blue" fill-opacity="1"/></svg>');
}
div.alpha {
left: 120px;
background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%"><rect x="0" y="0" width="100%" height="100%" fill="blue" fill-opacity="1"/></svg>');
}
div.luminance1 {
left: 230px;
background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%"><rect x="0" y="0" width="100%" height="100%" fill="rgb(238,238,255)" fill-opacity="1"/></svg>');
}
div.luminance2 {
left: 340px;
background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%"><rect x="0" y="0" width="100%" height="100%" fill="rgb(201,201,255)" fill-opacity="1"/></svg>');
}
div.luminance3 {
left: 450px;
background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%"><rect x="0" y="0" width="100%" height="100%" fill="rgb(73,73,255)" fill-opacity="1"/></svg>');
}
</style>
</head>
<body>
<div class="auto"></div>
<div class="alpha"></div>
<div class="luminance1"></div>
<div class="luminance2"></div>
<div class="luminance3"></div>
</body>
</html>
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