<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>WAI_1_5_2</title> </head> <body> <!--the following elements should raise errors--> <table id="table1"> <tbody> <tr> <th id="col1">col 1</th><th id="col2">col 2</th> </tr> <tr> <td>cell 1</td><td>cell 2</td> <td>cell 3</td><td>cell 4</td> </tr> </tbody> </table> <!--the following elements should be fine--> </body> </html>