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chromium/third_party/blink/web_tests/external/wpt/css/css-flexbox/flexbox_flex-auto.html 

<!DOCTYPE html>
<title>flexbox | flex: auto</title>
<link rel="author" href="http://opera.com" title="Opera Software">
<link rel="help" href="http://www.w3.org/TR/css-flexbox-1/#flex-common">
<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>