<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head class="before"> <title>CSS Test: CSS: Changing the background of the BODY element by changing a sibling's class</title> <link rel="author" title="Ian Hickson" href="mailto:ian@hixie.ch"> <link rel="alternate" href="http://www.hixie.ch/tests/adhoc/css/background/dynamic/001.html" type="text/html"> <meta name="flags" content="dom"> <link rel="help" href="http://www.w3.org/TR/CSS21/colors.html#background"> <link rel="match" href="reference/background-root-101-ref.htm"> <style type="text/css"> head.before + body { background: red; color: yellow; } head.after + body { background: green; color: white; } p.after { font-weight: bold; } </style> <script type="text/javascript"> function test() { document.getElementsByTagName('head')[0].className = 'after'; document.getElementsByTagName('p')[0].className = 'after'; } </script> </head> <body onload="setTimeout(test, 5)"> <p class="before">This page should be green (and this text should be bold -- if it isn't bold, something went wrong with the script part of the test).</p> </body> </html>