<!DOCTYPE html> <html class="reftest-wait"> <head> <script> function doTest() { document.getElementById('t').value = ''; document.documentElement.className=''; } document.addEventListener("MozReftestInvalidate", doTest, false); </script> </head> <!-- Test: if textarea isn't valid and it's value has been changed, it should be affected by :-moz-ui-invalid pseudo-class. --> <link rel='stylesheet' type='text/css' href='style.css'> <body> <textarea id='t' class='invalid' required></textarea> </body> </html>