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diff --git a/layout/reftests/css-ui-valid/button/button-disabled-fieldset-2.html b/layout/reftests/css-ui-valid/button/button-disabled-fieldset-2.html
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+++ b/layout/reftests/css-ui-valid/button/button-disabled-fieldset-2.html
@@ -0,0 +1,23 @@
+<!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>