<!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>