<!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 Flexible Box Reference File</title> <link href="mailto:phuangce@gmail.com" rel="author" title="Ping Huang" /> <style type="text/css"> #container { position: absolute; top: 100px; left: 10px; width: 200px; height: 300px; } .box { width: 100px; height: 100px; background-color: green; } #box1 { margin: 50px 0; } #box2 { margin: 100px 0; } </style> </head> <body> <p>The test passes if there are two green boxes and no red.</p> <div id="container"> <div class="box" id="box1"></div> <div class="box" id="box2"></div> </div> </body></html>