<!DOCTYPE html> <html class="reftest-wait"> <!-- Test: if input has a disabled fieldset ancestor, it is barred from constraint validation and should not be affected by :-moz-ui-invalid pseudo-class. --> <link rel='stylesheet' type='text/css' href='style.css'> <script> function onloadHandler() { var fieldsets = document.getElementsByTagName("fieldset"); fieldsets[1].disabled = true; fieldsets[0].disabled = false; document.documentElement.className=''; } </script> <body onload="onloadHandler();"> <fieldset disabled> <fieldset> <input class='notinvalid' required> </fieldset> </fieldset> </body> </html>