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<!doctype html>
<title>Test reference</title>
<style>
body { margin: 0 }
#outer, #inner {
background-color: purple;
width: 50%;
height: 100vh;
}
#inner {
position: absolute;
background-color: blue;
top: 0;
left: 50%;
}
</style>
<div id="outer">
<div id="inner"></div>
</div>