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Test Info:

<!DOCTYPE html>
<title>flexbox | flex: auto</title>
<link rel="author" href="http://opera.com" title="Opera Software">
<link rel="match" href="flexbox_flex-auto-ref.html">
<style>
div {
background: blue;
margin: 1em 0;
border: 1px solid black;
height: 8em;
width: 32em;
display: flex;
}
span {
background: white;
margin: 1em;
width: 5em;
display: inline-block;
flex: auto;
}
#flex span {
flex: 1 1 auto;
}
</style>
<div>
<span>one</span>
<span>two</span>
<span>three</span>
<span>four</span>
</div>
<div id="flex">
<span>one</span>
<span>two</span>
<span>three</span>
<span>four</span>
</div>