<!DOCTYPE HTML> <html> <head> <meta charset="utf-8"> <title>CSS Reftest Reference</title> <link rel="author" title="Kyle Zentner" href="mailto:zentner.kyle@gmail.com"> <link rel="author" title="Morgan Rae Reschenberg" href="mailto:mreschenberg@berkeley.edu"> <style> #a { display: contents; width: 100px; height: 100px; background: green; margin: 50px; } #b { position: absolute; top: 0; left: 0; width: 100px; height: 100px; background: green; } </style> </head> <body> <div id="a"> <div> <div id="b"></div> </div> </div> </body> </html>