css/css-grid/grid-items/grid-items-001.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Grid Layout Test: Regular and anonymous grid items</title>
<link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
<link rel="help" href="http://www.w3.org/TR/css-grid-1/#grid-items" title="4 Grid Items">
<link rel="match" href="../../reference/ref-filled-green-100px-square.xht">
<meta name="flags" content="ahem">
<meta name="assert" content="Checks that grid container children become grid items, and text that is directly contained inside the grid is wrapped in an anonymous grid item.">
<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;
    grid-template-columns: auto auto;
    justify-content: start;
    align-content: start;
  }
</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">
  <div>it</div>
  em
  <div>it</div>
  em
</div>
<div class="test-grid-overlapping-green">
  it
  <span>em</span>
  it
  <span>em</span>
</div>