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Test Info:
<!-- Blend two background images having background-attachment: fixed and scroll respectively -->
<!DOCTYPE HTML>
<html>
<head>
<style>
#parent {
width: 200px;
height: 200px;
overflow: hidden;
}
#child {
background: url('as-image/green100x100.png'), url('as-image/green100x100.png');
background-attachment: fixed, scroll;
background-size: 100px 100px, 200px 200px;
background-repeat: no-repeat no-repeat;
background-blend-mode: difference;
height: 400px;
}
body {
margin: 0px;
}
</style>
<script>
function onLoad() {
var parent = document.getElementById("parent");
parent.scrollTop = 100;
}
</script>
</head>
<body onload="onLoad()">
<div id="parent">
<div id="child">
</div>
</div>
</body>
</html>