<!DOCTYPE html> <html class='reftest-wait'> <head> <style> :-moz-submit-invalid { display: none; } </style> </head> <script> function onloadHandler() { document.getElementById('i').value = 'foo'; document.documentElement.className = ''; } </script> <body onload='onloadHandler();'> <form> <input id='i' required> <input type='submit'> </form> </body> </html>