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<!DOCTYPE html>
<style>
body {
overflow-y: auto;
width: 100%;
height: 200px;
margin: 0;
}
#overflowing-child {
background-color: red;
height: 200%;
width: 100%;
}
#target {
background-color: green;
height: 100%;
width: 100%;
}
</style>
<body>
<div id="overflowing-child"></div>
<div id="target"></div>
</body>