|  | <!DOCTYPE html> | 
|  | <link href="resources/flexbox.css" rel="stylesheet"> | 
|  | <style> | 
|  | .flexbox { | 
|  | background-color: green; | 
|  | } | 
|  | </style> | 
|  | <script src="../../resources/testharness.js"></script> | 
|  | <script src="../../resources/testharnessreport.js"></script> | 
|  | <script src="../../resources/check-layout-th.js"></script> | 
|  | <body onload="checkLayout('.flexbox')"> | 
|  | <div id=log></div> | 
|  |  | 
|  | <p>You should see a green rectangle, 20px high.</p> | 
|  |  | 
|  | <div class="flexbox column" data-expected-height="40"> | 
|  | <div id="child" data-expected-height="40"></div> | 
|  | </div> | 
|  |  | 
|  | <script> | 
|  | document.getElementById('child').offsetHeight; | 
|  | document.getElementById('child').style.padding = "20px"; | 
|  | </script> |