<!DOCTYPE html> <html class="reftest-wait"> <head> <script> function doTest() { document.getElementById('t').disabled='true'; document.documentElement.className=''; } document.addEventListener("MozReftestInvalidate", doTest); </script> </head> <!-- Test: if textarea is disabled, it is barred from constraint validation and should not be affected by :-moz-ui-valid pseudo-class. --> <link rel='stylesheet' type='text/css' href='style.css'> <body> <textarea class='notvalid' id='t'></textarea> </body> </html>