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chromium/third_party/blink/web_tests/external/wpt/css/css-grid/alignment/grid-content-alignment-with-abspos-001.html 

<!DOCTYPE html>
<html>
<head>
<title>CSS Grid Layout Test: dynamic content alignment with abspos elements.</title>
<link rel="author" title="Kurt Catti-Schmidt" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-grid/#alignment">
<link rel="help" href="https://drafts.csswg.org/css-align-3/#content-distribution">
<link rel="help" href="https://drafts.csswg.org/css-align-3/#propdef-align-content">
<link rel="help" href="https://drafts.csswg.org/css-align-3/#propdef-justify-content">
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1248940">
<link rel="stylesheet" href="/css/support/grid.css">
<link rel="stylesheet" href="/css/support/alignment.css">
<meta name="assert" content="Test that dynamically changing alignment for abspos grid items works as expected." />

<style>
body {
  margin: 0px;
  width: 800px;
}

.grid {
  width: 100%;
  height: 600px;
}

.a {
    width: 140px;
    height: 60px;
    border: 1px solid purple;
    position: absolute;
}
</style>

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
<script>
  function updateAlignmentAndCheckLayout() {
    let item = document.getElementById("item");
    item.style.alignSelf = "center";
    item.style.justifySelf = "center";
    checkLayout('.grid');
  }
</script>
</head>

<body onload="updateAlignmentAndCheckLayout()">

  <div class="grid" data-expected-width="800" data-expected-height="600">
    <div class="a" id="item" data-offset-x="329" data-offset-y="269" data-expected-width="142" data-expected-height="62"></div>
  </div>

</body>
</html>