<!DOCTYPE HTML>
<!--
     Any copyright is dedicated to the Public Domain.
     http://creativecommons.org/publicdomain/zero/1.0/
-->
<html><head>
  <meta charset="utf-8">
  <title>Reference: subgrid item using line names from outer grid</title>
  <link rel="author" title="Mats Palmgren" href="mailto:mats@mozilla.com">
  <style>
html,body {
  color:black; background-color:white; font:24px/1 monospace; padding:0; margin:0;
}

.grid {
  display: grid;
  grid: auto / [a] 50px 50px [a] 50px 50px [a];
  padding: 20px 10px;
}

.subgrid {
  display: grid;
  grid: 50px / subgrid;
  grid-column: span 3;
}

x { background: grey; }

  </style>
</head>
<body>

<div class="grid">
  <div class="subgrid">
    <x style="grid-column: 1 / 3"></x>
  </div>
</div>

</body>
</html>