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diff --git a/layout/reftests/mathml/maction-dynamic-3-ref.html b/layout/reftests/mathml/maction-dynamic-3-ref.html
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+++ b/layout/reftests/mathml/maction-dynamic-3-ref.html
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+<!DOCTYPE html>
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+<title>dynamic maction 3</title>
+</head>
+
+<body>
+
+<!-- This element generates an invalid markup error. -->
+<!-- We are assuming here that all invalid MathML markups look the same. -->
+<p><math><msup><mi>x</mi></msup></math></p>
+
+<p><math><mtext>--1--</mtext></math></p>
+
+<p><math><mtext>--1--</mtext></math></p>
+
+<p><math><msup><mi>x</mi></msup></math></p>
+
+<p><math><msup><mi>x</mi></msup></math></p>
+
+<p><math><mtext>--1--</mtext></math></p>
+
+<p><math><mtext>--1--</mtext></math></p>
+
+<p><math><mtext>--1--</mtext></math></p>
+
+<p><math><mtext>--1--</mtext></math></p>
+
+<p><math><mtext>--1--</mtext></math></p>
+
+<p><math><mtext>--1--</mtext></math></p>
+
+<p><math><msup><mi>x</mi></msup></math></p>
+
+</body>
+</html>