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chromium/third_party/blink/web_tests/external/wpt/css/css-grid/abspos/positioned-grid-items-023.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Grid Layout Test: Positioned grid items</title>
<link rel="help" href="https://drafts.csswg.org/css-grid-2/#abspos" title="9. Absolute Positioning">
<link rel="match" href="positioned-grid-items-023-ref.html">
<meta name="assert" content="Checks that absolutely positioned grid items with a strict contain attribute are properly placed in a grid.">
<style>
  #grid {
    display: inline-grid;
    grid-template-columns: 50px 50px;
    grid-template-rows: 50px 50px;
    background-color: blue;
    position: relative;
  }
  #child {
    grid-area: 2 / 2 / 2 / 2;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: green;
    contain: strict;
    position: absolute;
  }
  #grandchild {
    width: 50%;
    height: 50%;
    background-color: red;
  }
</style>

  <p>Test passes if it matches the reference.</p>

  <div id="grid">
    <div id="child">
      <marquee id="grandchild"></marquee>
    </div>
  </div>