<!DOCTYPE html> <html class="reftest-wait"> <head> <style type="text/css"> body { font-family: sans-serif; } #ib1 { display: inline-block; margin-right: 10px; } #ib2 { display: none; margin-left: 10px; margin-right: 20px; } #ib3 { display: inline-block; margin-left: 40px; } </style> <script type="text/javascript"> function test() { document.getElementById('ib2').style.display = 'inline-block'; document.documentElement.removeAttribute('class'); } document.addEventListener('MozReftestInvalidate', test, false); </script> </head> <body> <div><span id="ib1">Hello<span id="ib2">my</span></span><span id="ib3">Kitty</span></div> </body> </html>