<!DOCTYPE html> <html class="reftest-wait"> <!-- Test: if select 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 e = document.getElementById('s'); e.setCustomValidity('foo'); document.documentElement.className=''; } </script> <body onload="onLoadHandler();"> <fieldset disabled> <fieldset> <select class='notinvalid' id='s'></select> </fieldset> </fieldset> </body> </html>