<!DOCTYPE html> <html><head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>testcase</title> <style> .tt { border-collapse: collapse; } .nix { display: none; } .ref { border: solid 3px darkred; } td { width: 20px; height: 20px; } </style> </head> <body> <table class="tt"> <tr id="1"><td > </td></tr> <tr id="2" class="nix"><td > </td></tr> <tr id="3" class="ref"><td > </td></tr> <tr><td> </td></tr> </table> </body> </html>