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chromium/third_party/blink/web_tests/external/wpt/css/css-flexbox/flexbox_flex-0-0-0-ref.html 

<!DOCTYPE html>
<title>flexbox | flex: 0 0 0</title>
<link rel="author" href="http://opera.com" title="Opera Software">
<style>
div {
	background: blue;
	margin: 1em 0;
	border: 1px solid black;
	height: 8em;
	width: 40em;
}
span {
	background: white;
	margin: 1em 0;
	height: 6em;
	display: inline-block;
}
span:nth-child(1) {background: yellow;}
span:nth-child(2) {background: pink;}
span:nth-child(3) {background: lightblue;}
span:nth-child(4) {background: grey;}
</style>

<div>
	<span>one</span><span>two</span><span>three</span><span>four</span>
</div>