css/css-align/distribution-values/space-evenly-001.html

<!doctype html>
<html lang=en>
  <meta charset=utf-8>
  <title>CSS Box Alignment: space-evenly &amp; flexbox with single item</title>
  <link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net">
  <meta name=flags content="">
  <meta name=assert content="justify-content: space-evenly with flexbox and a single item must center it">
  <link rel="match" href="../../reference/ref-filled-green-100px-square.xht">
  <link rel=help href="https://drafts.csswg.org/css-align/#distribution-values">
  <link rel=help href="https://drafts.csswg.org/css-align/#fallback-alignment">
  <link rel=help href="https://drafts.csswg.org/css-flexbox-1/#justify-content-property">
<style>
.red {
  position: absolute;
  z-index: -1;
  width: 100px;
  height: 100px;
  background: red;
}
.container {
  margin-left: -100px;
  width: 300px;
  display: flex;
  justify-content: space-evenly;
}
.container div {
  width: 100px;
  height: 100px;
  background: green;
}
</style>

<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div class=red></div>
<div class=container><div></div></div>