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chromium/third_party/blink/web_tests/external/wpt/css/css-position/position-absolute-center-003.html 

<!DOCTYPE html>
<link rel="help" href="https://crbug.com/1081872">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<meta name="assert" content="A positioned absolute child with center alignment should be centered based on its margin-box.">
<style>
.s100 {
  width: 100px;
  height: 100px;
  box-sizing: border-box;
}
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div class="s100" style="position: relative;">
  <div class="s100" style="position: absolute; background: red; border: solid green; border-width: 30px 20px 20px 30px;"></div>
  <div class="s100" style="display: flex; align-items: center; justify-content: center;">
    <div style="position: absolute; width: 50px; height: 50px; margin-left: 10px; margin-top: 10px; background: green;"></div>
  </div>
</div>