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Test Info:

<!DOCTYPE html>
<title>CSS Test: background-size: cover with zero-sized background positioning area.</title>
<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
<link rel="author" href="https://mozilla.org" title="Mozilla">
<link rel="match" href="background-size-cover-003-ref.html">
<style>
body { margin: 0 }
div {
background-size: cover;
background-repeat: no-repeat;
background-position: top left;
background-origin: content-box;
background-image: url(/images/green-100x50.png);
}
#test1 {
height: 0;
width: 100px;
padding-bottom: 100px;
}
#test2 {
height: 100px;
width: 0;
padding-right: 100px;
}
#test3 {
height: 0;
width: 0;
padding-right: 100px;
padding-bottom: 100px;
}
</style>
<div id="test1"></div>
<div id="test2"></div>
<div id="test3"></div>