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diff --git a/layout/reftests/svg/as-image/img-novb-width-all-1-ref.html b/layout/reftests/svg/as-image/img-novb-width-all-1-ref.html
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+++ b/layout/reftests/svg/as-image/img-novb-width-all-1-ref.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+  <link rel="stylesheet" type="text/css" href="svg-image-util.css" />
+  <script src="svg-image-util.js"></script>
+</head>
+<body style="height: 600px"><!-- height for pct vals to resolve against -->
+  <script>
+      var svgParams = {
+        viewBox:  null,   // This gets set on a case-by-case basis below.
+        width  :  "20px",
+        height :  "20%",
+        meetOrSlice: null // This means "use pAR=none"
+      };
+
+      // Descriptions below describe the behavior of the rows of <img> elements
+      // in the corresponding test cases, which we mimic with specially-crafted
+      // <embed> elements.
+
+      // * FIRST TWO ROWS: <img> has width=auto height=auto
+      //  - Each <img> renders w/ height = 150px (default)
+      //  - Synthesized viewBox has height = 20% * viewport_height = .2*150 = 30
+      //  - <img> & viewBox both get width=20px, from <svg> width attr
+      svgParams.viewBox = [0, 0, 20, 30],
+      appendSVGSubArrayWithParams(svgParams, "embed", "20px", "150px");
+
+      // * SECOND TWO ROWS: <img> has width=auto, height=20px
+      //  - <img> now renders w/ height = 20px (imposed by <img> height attr)
+      //  - Synthesized viewBox has height = 20% * viewport_width = .2*20 = 4
+      //  - <img> & viewBox both get width=20px, from <svg> width attr
+      svgParams.viewBox = [0, 0, 20, 4],
+      appendSVGSubArrayWithParams(svgParams, "embed", "20px", "20px");
+
+      // * THIRD TWO ROWS: <img> has width=30px height=auto
+      // Calculations are as with "FIRST TWO ROWS", except <img> now imposes
+      // width="30px".
+      svgParams.viewBox = [0, 0, 20, 30],
+      appendSVGSubArrayWithParams(svgParams, "embed", "30px", "150px");
+
+      // * FOURTH TWO ROWS: <img> has width=30px height=20px
+      // Calculations are as with "SECOND TWO ROWS", except <img> now imposes
+      // width="30px".
+      svgParams.viewBox = [0, 0, 20, 4],
+      appendSVGSubArrayWithParams(svgParams, "embed", "30px", "20px");
+
+  </script>
+  <!-- Body gets populated by script -->
+</body>
+</html>