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diff --git a/layout/reftests/mathml/355548-3.xml b/layout/reftests/mathml/355548-3.xml
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+++ b/layout/reftests/mathml/355548-3.xml
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+<html xmlns="http://www.w3.org/1999/xhtml" xmlns:m="http://www.w3.org/1998/Math/MathML">
+<body>
+<!-- Test attribute parsing -->
+<p><m:math><m:mstyle scriptlevel="0" scriptsizemultiplier="0.5" scriptminsize="18px" style="font-size:48px;">
+  <!-- MathML number attributes cannot start with '+' -->
+  <m:mstyle scriptsizemultiplier="+1"><m:mstyle scriptlevel="+1"><m:mi>Id</m:mi></m:mstyle></m:mstyle>
+</m:mstyle></m:math></p>
+
+<p><m:math><m:mstyle scriptlevel="0" scriptsizemultiplier="0.5" scriptminsize="18px" style="font-size:48px;">
+  <m:mstyle mathsize="30px"><m:mi>Id</m:mi></m:mstyle>
+  <!-- CSS takes priority over mathsize -->
+  <m:mstyle mathsize="24px" style="font-size:30px;"><m:mi>Id</m:mi></m:mstyle>
+</m:mstyle></m:math></p>
+
+<p><m:math><m:mstyle scriptlevel="0" scriptsizemultiplier="0.5" scriptminsize="18px" style="font-size:48px;">
+  <m:mstyle mathsize="small"><m:mi>Id</m:mi></m:mstyle>
+  <m:mstyle mathsize="normal"><m:mi>Id</m:mi></m:mstyle>
+  <m:mstyle mathsize="big"><m:mi>Id</m:mi></m:mstyle>
+</m:mstyle></m:math></p>
+
+<p><m:math><m:mstyle scriptlevel="0" scriptsizemultiplier="0.5" scriptminsize="18px" style="font-size:48px;">
+  <m:mstyle mathbackground="green"><m:mi>Id</m:mi></m:mstyle>
+  <!-- CSS takes priority over mathbackground -->
+  <m:mstyle mathbackground="red" style="background:green;"><m:mi>Id</m:mi></m:mstyle>
+</m:mstyle></m:math></p>
+
+<p><m:math><m:mstyle scriptlevel="0" scriptsizemultiplier="0.5" scriptminsize="18px" style="font-size:48px;">
+  <m:mstyle mathbackground="#0F0"><m:mi>Id</m:mi></m:mstyle>
+  <m:mstyle mathbackground="#00FF00"><m:mi>Id</m:mi></m:mstyle>
+</m:mstyle></m:math></p>
+
+<p><m:math><m:mstyle scriptlevel="0" scriptsizemultiplier="0.5" scriptminsize="18px" style="font-size:48px;">
+  <m:mstyle mathcolor="green"><m:mi>Id</m:mi></m:mstyle>
+  <!-- CSS takes priority over mathcolor -->
+  <m:mstyle mathcolor="red" style="color:green;"><m:mi>Id</m:mi></m:mstyle>
+</m:mstyle></m:math></p>
+
+<p><m:math><m:mstyle scriptlevel="0" scriptsizemultiplier="0.5" scriptminsize="18px" style="font-size:48px;">
+  <!-- test invalid values for MathML length attributes -->
+  <m:mstyle mathsize="20 px"><m:mi>Id</m:mi></m:mstyle>
+  <m:mstyle mathsize=".px"><m:mi>Id</m:mi></m:mstyle>
+  <m:mstyle mathsize="..px"><m:mi>Id</m:mi></m:mstyle>
+  <m:mstyle mathsize="+20px"><m:mi>Id</m:mi></m:mstyle>
+  <m:mstyle mathsize="0.5"><m:mi>Id</m:mi></m:mstyle>
+  <m:mstyle mathsize="24.px"><m:mi>Id</m:mi></m:mstyle>
+</m:mstyle></m:math></p>
+
+<p><m:math><m:mstyle scriptlevel="0" scriptsizemultiplier="0.5" scriptminsize="18px" style="font-size:48px;">
+  <!-- test valid values for MathML length attributes -->
+  <m:mstyle mathsize=" 24px "><m:mi>Id</m:mi></m:mstyle>
+  <m:mstyle mathsize="24.0px"><m:mi>Id</m:mi></m:mstyle>
+  <m:mstyle mathsize="50%"><m:mi>Id</m:mi></m:mstyle>
+  <m:mstyle mathsize=".0px"><m:mi>Id</m:mi></m:mstyle>
+  <m:mstyle mathsize="-0px"><m:mi>Id</m:mi></m:mstyle>
+  <m:mstyle mathsize="0"><m:mi>Id</m:mi></m:mstyle>
+  <m:mstyle mathsize="20PX"><m:mi>Id</m:mi></m:mstyle>
+</m:mstyle></m:math></p>
+
+</body>
+</html>