<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"><head> <title>CSS Reftest Reference</title> <link href="mailto:badea@adobe.com" rel="author" title="Catalin Badea" /> <style> .flex { height: 100px; width: 100px; background-color: green; } .region { height: 150px; width: 200px; background-color: gray; } </style> </head> <body> <ul> <li>Test passes if you see a green square inside a gray rectangle.</li> <li>You shouldn't see any red.</li> </ul> <div class="region"> <div class="flex"> </div> </div> </body></html>