<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html><head><title>CSS Test: border collapse dynamic change to row border width</title> <link rel="author" title="Bernd Mielke" href="mailto:bmlk@gmx.de"> <link rel="help" href="http://www.w3.org/TR/CSS21/tables.html#collapsing-borders"> <link rel="match" href="reference/border-collapse-dynamic-rowgroup-002-ref.htm"> <meta http-equiv="Content-Script-Type" content="text/javascript"> <meta name="flags" content="dom"> <script type="text/javascript"> function doTest(){ var t1 =document.getElementById('target'); t1.style.borderWidth="20px"; } </script> <style type="text/css"> td { border: 10px green solid;} table {margin: 30px; border-collapse:collapse} tr#target {border:solid green 2px} </style> </head> <body onload="doTest();"> <p>There should be continuous solid thicker border around the middle row. The text inside the cells should not overlap any of the borders.</p> <table> <tbody><tr><td>c11</td><td>c12</td><td>c13</td></tr> <tr id="target"><td>c21</td><td>c22</td><td>c23</td></tr> <tr><td>c31</td><td>c32</td><td>c33</td></tr> </tbody></table> </body></html>