css/css-grid/subgrid/grid-gap-004.html

<!DOCTYPE HTML>
<html><head>
  <meta charset="utf-8">
  <title>CSS Grid Test: nested subgrid</title>
  <link rel="author" title="Mats Palmgren" href="mailto:mats@mozilla.com">
  <link rel="help" href="https://drafts.csswg.org/css-grid-2">
  <link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
  <link rel="match" href="grid-gap-004-ref.html">
<style>
html,body {
  color:black; background-color:white; font:24px/1 Ahem; padding:0; margin:0;
}

.grid {
  display:inline-grid;
  grid:100px auto/100px auto;
  gap:20px;
  border:3px solid;
  background:yellow;
}
span { background:cyan; }
span:nth-child(2n+1) { background:grey; }
</style>
</head>
<body>

<div class="grid">
  <div style="display:grid; grid:subgrid/subgrid; gap:100px; grid-area:span 2/span 2">
    <div style="display:grid; grid:subgrid/100px; gap:100px; grid-row:span 2">
      <span>a</span><span>b</span>
    </div>
    <span style="grid-area:2/2">c</span>
  </div>
</div>

</body>
</html>