<!DOCTYPE html> <html class="reftest-wait"> <head> <style type="text/css"> #inline-block { display: inline-block; margin: 10px 0; background-color: green; } #block { margin: 10px 0; background-color: lightgreen; } </style> <script type="text/javascript"> function test() { document.getElementById('block').style.display = 'block'; document.documentElement.removeAttribute('class'); } document.addEventListener('MozReftestInvalidate', test, false); </script> </head> <body> <div id="inline-block"><span id="block">Hello Kitty</span></div> </body> </html>