<!DOCTYPE html> <html class="reftest-wait"> <head> <style> #t { display: none; } </style> <script lang="JavaScript"> function toggleLayer(id) { var s = document.getElementById(id).style; s.display = s.display ? "" : "block"; } function doTest() { toggleLayer('t'); document.body.offsetWidth; toggleLayer('t'); document.body.offsetWidth; toggleLayer('t'); document.documentElement.className = ""; } </script> </head> <body onload="doTest()"> <table style="width: 100%;" border="5"> <tr> <td id="t">First row</td> </tr> <tr> <td>Second row</td> </tr> </table> </body> </html>