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<!DOCTYPE html>
<html class="reftest-wait">
<!-- Test: if button has a disabled fieldset ancestor, it is barred from
constraint validation and should not be affected by :valid
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>
<button class='notvalid'></button>
</fieldset>
</fieldset>
</body>
</html>
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