<!DOCTYPE html> <html class="reftest-wait"> <head> <style type="text/css"> .block { height: 20px; background-color: green; } #table { display: table; width: 100px; margin: 10px 0; } #caption { display: table-cell; caption-side: top; height: 20px; margin: 20px 0; background-color: blue; } #cell { display: table-cell; height: 20px; background-color: orange; } </style> <script type="text/javascript"> function test() { document.getElementById('caption').style.display = 'table-caption'; document.documentElement.removeAttribute('class'); } document.addEventListener('MozReftestInvalidate', test, false); </script> </head> <body> <div class="block"></div> <div id="table"> <div id="caption"></div> <div id="cell"></div> </div> <div class="block"></div> </body> </html>