<!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="posit