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<!DOCTYPE html>
<!--
Any copyright is dedicated to the Public Domain.
-->
<!--
Reference case, with testcase's dynamic tweak already performed.
-->
<html>
<head>
<style>
div#outer { margin-left: 40px }
div#flexContainer {
width: 100px;
height: 50px;
background: lightgray;
display: flex;
justify-content: center;
}
div#flexItem {
border: 1px solid black;
height: 200%;
background: purple;
}
</style>
</head>
<body>
<div id="outer">
<div id="flexContainer">
<div id="flexItem">item</div>
</div>
</div>
</body>
</html>