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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<!-- Test: if textarea 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'>
function onloadHandler()
var fieldsets = document.getElementsByTagName("fieldset");
fieldsets[1].disabled = true;
fieldsets[0].disabled = false;
<body onload="onloadHandler();">
<fieldset disabled>
<textarea class='notinvalid' required></textarea>