<!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><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>CSS Test: Column group boxes occupy same cells as the columns they contain</title> <link rel="author" title="Microsoft" href="http://www.microsoft.com/" /> <link rel="help" href="http://www.w3.org/TR/CSS21/tables.html#table-layout" /> <meta name="flags" content="" /> <meta name="assert" content="A column group box occupies the same cells as the columns it contains." /> <style type="text/css"> #black { background: blue; } td { border: 1px solid black; height: 2em; width: 2em; } </style> </head> <body> <p>Test passes if the middle two columns in the table are blue.</p> <table> <colgroup> <col /> </colgroup> <colgroup id="black"> <col /> <col /> </colgroup> <colgroup> <col /> </colgroup> <tr> <td></td> <td></td> <td></td> <td></td> </tr> <tr> <td></td> <td></td> <td></td> <td></td> </tr> <tr> <td></td> <td></td> <td></td> <td></td> </tr> <tr> <td></td> <td></td> <td></td> <td></td> </tr> </table> </body> </html>