Sandbox::https://github.com/web-platform-tests/wpt/blob/master/css/css-flexbox/flexbox

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<!DOCTYPE html>

<title>flexbox | flex: N 0</title>

<style>

div {

background: blue;

margin: 1em 0;

border: 1px solid black;

height: 8em;

width: 40em;

display: flex;

}

span {

background: white;

margin: 1em 0;

width: 5em;

display: inline-block;

flex: 4 0;

}

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>three</span>

</div>