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diff --git a/layout/reftests/bugs/355548-2.xml b/layout/reftests/bugs/355548-2.xml
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+<html xmlns="http://www.w3.org/1999/xhtml" xmlns:m="http://www.w3.org/1998/Math/MathML">
+<body>
+<!-- Test interactions between CSS font-size and scriptlevel changes -->
+<p><m:math><m:mstyle scriptlevel="0" scriptsizemultiplier="0.5" scriptminsize="18px" style="font-size:48px;">
+  <m:mstyle scriptlevel="+5"><m:mi>Id</m:mi></m:mstyle>
+  <!-- Test that we can explicitly go below scriptminsize -->
+  <m:mi style="font-size:10px;">Id</m:mi>
+  <!-- Test that a relative font-size ignores the scriptlevel change in the same element -->
+  <m:mstyle scriptlevel="+5" style="font-size:100%;"><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 that scriptlevel changes are incremental (this should be 24px) -->
+  <m:mstyle scriptlevel="+1" style="font-size:48px;"><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;">
+  <!-- Decreasing the font size due to a scriptlevel change should do nothing when we're below minscriptsize -->
+  <m:mstyle style="font-size:10px;"><m:mstyle scriptlevel="+1"><m:mi>Id</m:mi></m:mstyle></m:mstyle>
+  <!-- but we can increase -->
+  <m:mstyle style="font-size:10px;"><m:mstyle scriptlevel="-1"><m:mi>Id</m:mi></m:mstyle></m:mstyle>
+  <m:mstyle style="font-size:10px;"><m:mstyle scriptlevel="-2"><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;">
+  <!-- An absolute font-size value resets the unconstrained size to that value, so we
+       can increase above that value with a negative scriptlevel change -->
+  <m:mstyle scriptlevel="+5"><m:mstyle style="font-size:24px;"><m:mstyle scriptlevel="-1"><m:mi>Id</m:mi></m:mstyle></m:mstyle></m:mstyle>
+  <!-- An relative font-size value is applied to the unconstrained size -->
+  <m:mstyle scriptlevel="+2"><m:mstyle style="font-size:200%;"><m:mstyle scriptlevel="-1"><m:mi>Id</m:mi></m:mstyle></m:mstyle></m:mstyle>
+  <!-- The unconstrained size does not cap the font size to below scriptminsize (so this is 18px) -->
+  <m:mstyle scriptlevel="+2"><m:mstyle style="font-size:50%;"><m:mstyle scriptlevel="-1"><m:mi>Id</m:mi></m:mstyle></m:mstyle></m:mstyle>
+  <!-- The unconstrained size cap the font size otherwise (so this is 12px) -->
+  <m:mstyle scriptlevel="+2"><m:mstyle style="font-size:50%;" scriptminsize="0"><m:mstyle scriptlevel="-1"><m:mi>Id</m:mi></m:mstyle></m:mstyle></m:mstyle>
+</m:mstyle></m:math></p>
+
+</body>
+</html>