<!DOCTYPE html> <html> <!-- Test: if textarea has a disabled fieldset ancestor, but is in the first legend, it is not barred from constraint validation and should be affected by :invalid pseudo-class. --> <link rel='stylesheet' type='text/css' href='style.css'> <body> <fieldset disabled> <legend> <textarea class='invalid' required></textarea> </legend> </fieldset> </body> </html>