css/css-grid/grid-model/grid-display-grid-001.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Grid Layout Test: 'grid' value for 'display' property</title>
<link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
<link rel="reviewer" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/"> <!-- 2014-11-18 -->
<link rel="help" href="http://www.w3.org/TR/css-grid-1/#grid-containers" title="3.1 Establishing Grid Containers">
<link rel="match" href="../../reference/ref-filled-green-100px-square.xht">
<meta name="flags" content="ahem">
<meta name="assert" content="This test checks that 'grid' value for 'display' property generates a block level containing box.">
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<style>
  #reference-overlapped-red {
    position: absolute;
    background-color: red;
    width: 100px;
    height: 100px;
    z-index: -1;
  }

  .test-grid-overlapping-green {
    display: grid;
    font: 25px/1 Ahem;
    color: green;
  }
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>

<div id="reference-overlapped-red"></div>
<div class="test-grid-overlapping-green">
  <span>firs</span>
  <span>seco</span>
</div>
<div class="test-grid-overlapping-green">
  <span>firs</span>
  <span>seco</span>
</div>