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background-clip-padding-box-with-border-radius.html
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<!DOCTYPE html>
<html>
<!-- Submitted from TestTWF Paris -->
<head>
<title>CSS Backgrounds and Borders Test: background-clip: padding-box with border-radius</title>
<link rel="author" title="Lea Verou" href="http://lea.verou.me" />
<link rel="help" href="http://www.w3.org/TR/css3-background/#the-background-clip" />
<link rel="help" href="http://www.w3.org/TR/css3-background/#corner-shaping" />
<meta name="flags" content="" />
<meta name="assert" content="Backgrounds clipped to the padding box should follow the padding box curve, which should be equal to the outer border radius minus the corresponding border thickness." />
<style>
div {
position: absolute;
}
.container {
position: relative;
width: 140px;
height: 140px;
margin: 10px;
}
.ref {
top: 10px;
left: 10px;
height: 140px;
width: 140px;
border-radius: 30px;
}
.test {
width: 100px;
height: 100px;
padding: 20px;
border: 10px solid transparent;
border-radius: 40px;
background-clip: padding-box;
}
.behind {
background-color: red;
}
.top {
background-color: green;
}
.ref.top {
width: 144px;
height: 144px;
left: 8px;
top: 8px;
}
.test.top {
width: 104px;
height: 104px;
left: -2px;
top: -2px;
}
</style>
</head>
<body>
<p>Test passes if there are two filled green rounded squares and <strong>no red</strong>.</p>
<div class="container">
<div class="test behind"></div>
<div class="ref top"></div>
</div>
<div class="container">
<div class="ref behind"></div>
<div class="test top"></div>
</div>
</body>
</html>