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Test Info:

<!DOCTYPE html>
<title>flexbox | justify-content: center / overflow</title>
<link rel="author" href="http://opera.com" title="Opera Software">
<link rel="author" href="mailto:dgrogan@chromium.org" title="David Grogan">
<link rel="help"
<meta name="assert" content="Items that overflow a singleline justify-content:center flexbox container are positioned correctly.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
Blue is the flexbox. Orange are items that overflow it.
<style>
.flexbox {
background: blue;
margin-left: 50px;
height: 150px;
width: 50px;
display: flex;
justify-content: center;
position: relative;
}
span {
background: orange;
margin: 10px;
flex: 1 0 40px;
}
</style>
<div class=flexbox>
<span data-expected-width=40 data-offset-x=-55></span>
<span data-expected-width=40 data-offset-x=5></span>
<span data-expected-width=40 data-offset-x=65></span>
</div>
<script>
checkLayout('span');
</script>