<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd"> <html lang="en"> <head> <title>aert1.0/5.1.2</title> </head> <body> <table summary="This data table is missing one row header"> <caption>This data table is missing one row header</caption> <tr> <th>age</th> <td>10</td> <td>15</td> <td>20</td> </tr> <tr> <td>height</td> <td>1.3 m</td> <td>1.8 m</td> <td>2.1 m</td> </tr> <tr> <th>weight</th> <td>50 kg</td> <td>75 kg.</td> <td>100 kg.</td> </tr> </table> </body> </html>