<!DOCTYPE html> <html class="reftest-wait"> <!-- Test: if output has a custom error, it should not be affected by :valid pseudo-class. --> <link rel='stylesheet' type='text/css' href='style.css'> <body onload="document.getElementById('b').setCustomValidity('foo'); document.documentElement.className='';"> <output class='notvalid' id='b'>foo</output> </body> </html>