<!DOCTYPE HTML>
<html><head>
  <meta charset="utf-8">
  <title>Reference: nested subgrid</title>
  <link rel="author" title="Mats Palmgren" href="mailto:mats@mozilla.com">
  <link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
<style>
html,body {
  color:black; background-color:white; font:24px/1 Ahem; padding:0; margin:0;
}

span { background:cyan; }
span:nth-child(2n+1) { background:grey; }
</style>
</head>
<body>

<div style="display:inline-grid; grid:100px/100px 0px; gap:100px; border:1px solid;">
  <div style="display:grid; grid:100px/140px calc(40px); gap:20px; grid-column:span 2">
    <span>a</span><span>b</span>
  </div>
</div>

</body>
</html>