diff --git a/mathml/presentation-markup/direction/direction-mpadded-ref.html b/mathml/presentation-markup/direction/direction-mpadded-ref.html
new file mode 100644
index 00000000000000..98208d6849f746
--- /dev/null
+++ b/mathml/presentation-markup/direction/direction-mpadded-ref.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8"/>
+    <title>Verify dir attribute on mpadded (reference)</title>
+  </head>
+  <body>
+    <p>
+      mpadded lspace="25px" width="150px":
+      <math>
+        <mspace width="1px" height="25px" mathbackground="black"/>
+        <mpadded lspace="50px" width="150px">
+          <mspace width="25px" height="25px" mathbackground="blue"/>
+          <mspace width="25px" height="25px" mathbackground="green"/>
+          <mspace width="25px" height="25px" mathbackground="red"/>
+        </mpadded>
+        <mspace width="1px" height="25px" mathbackground="black"/>
+      </math>
+    </p>
+  </body>
+</html>
diff --git a/mathml/presentation-markup/direction/direction-mpadded.html b/mathml/presentation-markup/direction/direction-mpadded.html
new file mode 100644
index 00000000000000..772535171d5636
--- /dev/null
+++ b/mathml/presentation-markup/direction/direction-mpadded.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8"/>
+    <title>Verify dir attribute on mpadded</title>
+    <link rel="help" href="https://w3c.github.io/mathml-core/#attributes-common-to-html-and-mathml-elements">
+    <link rel="help" href="https://w3c.github.io/mathml-core/#css-styling">
+    <link rel="help" href="https://w3c.github.io/mathml-core/#adjust-space-around-content-mpadded">
+    <meta name="assert" content="Verify dir attribute on mpadded.">
+    <link rel="match" href="direction-mpadded-ref.html">
+  </head>
+  <body>
+    <p>
+      mpadded lspace="25px" width="150px":
+      <math dir="rtl">
+        <mspace width="1px" height="25px" mathbackground="black"/>
+        <mpadded lspace="25px" width="150px">
+          <mspace width="25px" height="25px" mathbackground="red"/>
+          <mspace width="25px" height="25px" mathbackground="green"/>
+          <mspace width="25px" height="25px" mathbackground="blue"/>
+        </mpadded>
+        <mspace width="1px" height="25px" mathbackground="black"/>
+      </math>
+    </p>
+
+    <script src="/mathml/support/feature-detection.js"></script>
+    <script>MathMLFeatureDetection.ensure_for_match_reftest("has_mspace");</script>
+  </body>
+</html>
diff --git a/mathml/presentation-markup/fractions/frac-linethickness-001-ref.html b/mathml/presentation-markup/fractions/frac-linethickness-001-ref.html
index d4be8ea03bfc29..4057f93fcc31e0 100644
--- a/mathml/presentation-markup/fractions/frac-linethickness-001-ref.html
+++ b/mathml/presentation-markup/fractions/frac-linethickness-001-ref.html
@@ -16,7 +16,7 @@
     </style>
   </head>
   <body>
-    <p>This test passes if you see the same fraction four times.</p>
+    <p>This test passes if you see the same fraction eight times.</p>
     <math>
       <mfrac>
         <mspace width="20px" height="10px" style="background: blue"></mspace>
@@ -37,6 +37,26 @@
         <mspace width="20px" height="10px" style="background: blue"></mspace>
         <mspace width="20px" height="10px" style="background: cyan"></mspace>
       </mfrac>
+      <mspace width="20px"/>
+      <mfrac>
+        <mspace width="20px" height="10px" style="background: blue"></mspace>
+        <mspace width="20px" height="10px" style="background: cyan"></mspace>
+      </mfrac>
+      <mspace width="20px"/>
+      <mfrac>
+        <mspace width="20px" height="10px" style="background: blue"></mspace>
+        <mspace width="20px" height="10px" style="background: cyan"></mspace>
+      </mfrac>
+      <mspace width="20px"/>
+      <mfrac>
+        <mspace width="20px" height="10px" style="background: blue"></mspace>
+        <mspace width="20px" height="10px" style="background: cyan"></mspace>
+      </mfrac>
+      <mspace width="20px"/>
+      <mfrac>
+        <mspace width="20px" height="10px" style="background: blue"></mspace>
+        <mspace width="20px" height="10px" style="background: cyan"></mspace>
+      </mfrac>
     </math>
   </body>
 </html>
diff --git a/mathml/presentation-markup/fractions/frac-linethickness-001.html b/mathml/presentation-markup/fractions/frac-linethickness-001.html
index 918d4aba6e690d..99f751026399f5 100644
--- a/mathml/presentation-markup/fractions/frac-linethickness-001.html
+++ b/mathml/presentation-markup/fractions/frac-linethickness-001.html
@@ -19,7 +19,7 @@
     </style>
   </head>
   <body>
-    <p>This test passes if you see the same fraction four times.</p>
+    <p>This test passes if you see the same fraction eight times.</p>
     <math>
       <mfrac linethickness="thin">
         <mspace width="20px" height="10px" style="background: blue"></mspace>
@@ -40,6 +40,26 @@
         <mspace width="20px" height="10px" style="background: blue"></mspace>
         <mspace width="20px" height="10px" style="background: cyan"></mspace>
       </mfrac>
+      <mspace width="20px"/>
+      <mfrac linethickness="100%">
+        <mspace width="20px" height="10px" style="background: blue"></mspace>
+        <mspace width="20px" height="10px" style="background: cyan"></mspace>
+      </mfrac>
+      <mspace width="20px"/>
+      <mfrac linethickness="100%">
+        <mspace width="20px" height="10px" style="background: blue"></mspace>
+        <mspace width="20px" height="10px" style="background: cyan"></mspace>
+      </mfrac>
+      <mspace width="20px"/>
+      <mfrac linethickness="2km">
+        <mspace width="20px" height="10px" style="background: blue"></mspace>
+        <mspace width="20px" height="10px" style="background: cyan"></mspace>
+      </mfrac>
+      <mspace width="20px"/>
+      <mfrac linethickness="cat">
+        <mspace width="20px" height="10px" style="background: blue"></mspace>
+        <mspace width="20px" height="10px" style="background: cyan"></mspace>
+      </mfrac>
     </math>
     <script src="/mathml/support/feature-detection.js"></script>
     <script>MathMLFeatureDetection.ensure_for_match_reftest("has_mfrac");</script>
