<!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 Test: Blended element with transition</title> <link href="mitica@adobe.com" rel="author" title="Mihai Tica" /> <meta content="dom" name="flags" /> <style type="text/css"> div { width: 100px; height: 100px; } #blender { background: #0F0; transition: opacity 1s ease; } .opaqueBox { opacity: 0.4; } </style> </head> <body> <p>Test passes if you can see a fading green rectangle.</p> <div style="background: #FF0;"><div id="blender"></div></div> <script type="text/javascript"> setInterval(function(){ document.getElementById('blender').className = 'opaqueBox'; }, 100); </script> </body></html>