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diff --git a/layout/reftests/svg/viewBox-invalid-01.svg b/layout/reftests/svg/viewBox-invalid-01.svg
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+++ b/layout/reftests/svg/viewBox-invalid-01.svg
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+<svg xmlns="http://www.w3.org/2000/svg" version="1.1"
+     xmlns:xlink="http://www.w3.org/1999/xlink">
+  <title>Testing invalid values for |viewBox| attribute</title>
+  <defs>
+    <rect id="redRect"  fill="red"  height="10" width="10"/>
+    <rect id="limeRect" fill="lime" height="10" width="10"/>
+  </defs>
+  <rect fill="lime" height="100%" width="100%"/>
+
+  <!-- SUMMARY: Each <svg> subdocument below has an invalid viewBox. If we
+       honor the invalid viewBox (ignoring typos), that will make us scale
+       the <use>'d redRect to appear larger than the limeRect, and we'll have
+       some red showing (and we'll fail the test). -->
+
+  <!-- First row: Initial comma(s) -->
+  <g transform="translate(0, 0)">
+    <g transform="translate(0, 0)">
+      <svg width="20" height="20" viewBox=",0,0,1,1">
+        <use xlink:href="#redRect"/>
+      </svg><use xlink:href="#limeRect"/>
+    </g>
+    <g transform="translate(40, 0)">
+      <svg width="20" height="20" viewBox=",,0,0,1,1">
+        <use xlink:href="#redRect"/>
+      </svg><use xlink:href="#limeRect"/>
+    </g>
+    <g transform="translate(80, 0)">
+      <svg width="20" height="20" viewBox=", ,0,0,1,1">
+        <use xlink:href="#redRect"/>
+      </svg><use xlink:href="#limeRect"/>
+    </g>
+    <g transform="translate(120, 0)">
+      <svg width="20" height="20" viewBox=", 0,0,1,1">
+        <use xlink:href="#redRect"/>
+      </svg><use xlink:href="#limeRect"/>
+    </g>
+    <g transform="translate(160, 0)">
+      <svg width="20" height="20" viewBox=",,, 0,0,1,1">
+        <use xlink:href="#redRect"/>
+      </svg><use xlink:href="#limeRect"/>
+    </g>
+  </g>
+  <!-- Second row: Trailing comma(s) -->
+  <g transform="translate(0, 40)">
+    <g transform="translate(0, 0)">
+      <svg width="20" height="20" viewBox="0,0,1,1,">
+        <use xlink:href="#redRect"/>
+      </svg><use xlink:href="#limeRect"/>
+    </g>
+    <g transform="translate(40, 0)">
+      <svg width="20" height="20" viewBox="0,0,1,1 ,">
+        <use xlink:href="#redRect"/>
+      </svg><use xlink:href="#limeRect"/>
+    </g>
+    <g transform="translate(80, 0)">
+      <svg width="20" height="20" viewBox="0,0,1,1,,">
+        <use xlink:href="#redRect"/>
+      </svg><use xlink:href="#limeRect"/>
+    </g>
+    <g transform="translate(120, 0)">
+      <svg width="20" height="20" viewBox="0,0,1,1, ,">
+        <use xlink:href="#redRect"/>
+      </svg><use xlink:href="#limeRect"/>
+    </g>
+    <g transform="translate(160, 0)">
+      <svg width="20" height="20" viewBox="0,0,1,1 ,,,">
+        <use xlink:href="#redRect"/>
+      </svg><use xlink:href="#limeRect"/>
+    </g>
+  </g>
+  <!-- Third row: Repeated commas in the middle -->
+  <g transform="translate(0, 80)">
+    <g transform="translate(0, 0)">
+      <svg width="20" height="20" viewBox="0,,0,1,1">
+        <use xlink:href="#redRect"/>
+      </svg><use xlink:href="#limeRect"/>
+    </g>
+    <g transform="translate(40, 0)">
+      <svg width="20" height="20" viewBox="0,,,0,1,1">
+        <use xlink:href="#redRect"/>
+      </svg><use xlink:href="#limeRect"/>
+    </g>
+    <g transform="translate(80, 0)">
+      <svg width="20" height="20" viewBox="0, ,0,1,1">
+        <use xlink:href="#redRect"/>
+      </svg><use xlink:href="#limeRect"/>
+    </g>
+    <g transform="translate(120, 0)">
+      <svg width="20" height="20" viewBox="0 0,, 1,1">
+        <use xlink:href="#redRect"/>
+      </svg><use xlink:href="#limeRect"/>
+    </g>
+    <g transform="translate(160, 0)">
+      <svg width="20" height="20" viewBox="0 0,,1 1">
+        <use xlink:href="#redRect"/>
+      </svg><use xlink:href="#limeRect"/>
+    </g>
+  </g>
+  <!-- Fourth row: wrong number of values -->
+  <g transform="translate(0, 120)">
+    <g transform="translate(0, 0)">
+      <svg width="20" height="20" viewBox="">
+        <use xlink:href="#redRect"/>
+      </svg><use xlink:href="#limeRect"/>
+    </g>
+    <g transform="translate(40, 0)">
+      <svg width="20" height="20" viewBox="0">
+        <use xlink:href="#redRect"/>
+      </svg><use xlink:href="#limeRect"/>
+    </g>
+    <g transform="translate(80, 0)">
+      <svg width="20" height="20" viewBox="0 0">
+        <use xlink:href="#redRect"/>
+      </svg><use xlink:href="#limeRect"/>
+    </g>
+    <g transform="translate(120, 0)">
+      <svg width="20" height="20" viewBox="0 0 1">
+        <use xlink:href="#redRect"/>
+      </svg><use xlink:href="#limeRect"/>
+    </g>
+    <g transform="translate(160, 0)">
+      <svg width="20" height="20" viewBox="0 0 1 1 1 ">
+        <use xlink:href="#redRect"/>
+      </svg><use xlink:href="#limeRect"/>
+    </g>
+  </g>
+</svg>