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diff --git a/layout/reftests/svg/image/util.js b/layout/reftests/svg/image/util.js
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+++ b/layout/reftests/svg/image/util.js
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+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// The possible values of the "align" component of preserveAspectRatio.
+const ALIGN_VALS = ["none",
+                    "xMinYMin", "xMinYMid", "xMinYMax",
+                    "xMidYMin", "xMidYMid", "xMidYMax",
+                    "xMaxYMin", "xMaxYMid", "xMaxYMax"];
+
+// The possible values of the "meetOrSlice" component of preserveAspectRatio.
+const MEETORSLICE_VALS = [ "meet", "slice" ];
+
+const SVGNS   = "http://www.w3.org/2000/svg";
+const XLINKNS = "http://www.w3.org/1999/xlink";
+
+// This is the separation between the x & y values of each <image> in a
+// generated grid.
+const IMAGE_OFFSET = 50;
+
+function generateBorderRect(aX, aY, aWidth, aHeight) {
+  var rect = document.createElementNS(SVGNS, "rect");
+  rect.setAttribute("x", aX);
+  rect.setAttribute("y", aY);
+  rect.setAttribute("width", aWidth);
+  rect.setAttribute("height", aHeight);
+  rect.setAttribute("fill", "none");
+  rect.setAttribute("stroke", "black");
+  rect.setAttribute("stroke-width", "2");
+  rect.setAttribute("stroke-dasharray", "3 2");
+  return rect;
+}
+
+// Returns an SVG <image> element with the given xlink:href, width, height,
+// and preserveAspectRatio=[aAlign aMeetOrSlice] attributes
+function generateImageElementForParams(aX, aY, aWidth, aHeight,
+                                       aHref, aAlign, aMeetOrSlice) {
+  var image = document.createElementNS(SVGNS, "image");
+  image.setAttribute("x", aX);
+  image.setAttribute("y", aY);
+  image.setAttribute("width", aWidth);
+  image.setAttribute("height", aHeight);
+  image.setAttributeNS(XLINKNS, "href", aHref);
+  image.setAttribute("preserveAspectRatio", aAlign + " " + aMeetOrSlice);
+  return image;
+}
+
+// Returns a <g> element filled with a grid of <image> elements which each
+// have the specified aWidth & aHeight and which use all possible values of
+// preserveAspectRatio.
+//
+// The final "aBonusPARVal" argument (if specified) is used as the
+// preserveAspectRatio value on a bonus <image> element, added at the end.
+function generateImageGrid(aHref, aWidth, aHeight, aBonusPARVal) {
+  var grid = document.createElementNS(SVGNS, "g");
+  var y = 0;
+  var x = 0;
+  for (var i = 0; i < ALIGN_VALS.length; i++) {
+    // Jump to next line of grid, for every other "i" value.
+    // (every fourth entry)
+    if (i && i % 2 == 0) {
+      y += IMAGE_OFFSET;
+      x = 0;
+    }
+    var alignVal = ALIGN_VALS[i];
+    for (var j = 0; j < MEETORSLICE_VALS.length; j++) {
+      var meetorsliceVal = MEETORSLICE_VALS[j];
+      var border = generateBorderRect(x, y, aWidth, aHeight);
+      var image  = generateImageElementForParams(x, y, aWidth, aHeight,
+                                                 aHref, alignVal,
+                                                 meetorsliceVal);
+      grid.appendChild(border);
+      grid.appendChild(image);
+      x += IMAGE_OFFSET;
+    }
+  }
+
+  if (aBonusPARVal) {
+    // Add one final entry with "bonus" pAR value.
+    y += IMAGE_OFFSET;
+    x = 0;
+    var border = generateBorderRect(x, y, aWidth, aHeight);
+    var image  = generateImageElementForParams(x, y, aWidth, aHeight,
+                                               aHref, aBonusPARVal, "");
+    grid.appendChild(border);
+    grid.appendChild(image);
+  }
+
+  return grid;
+}
+
+// Returns an SVG <symbol> element that...
+//  (a) has the given ID
+//  (b) contains only a <use> element to the given URI
+//  (c) has a hardcoded viewBox="0 0 10 10" attribute
+//  (d) has the given preserveAspectRatio=[aAlign aMeetOrSlice] attribute
+function generateSymbolElementForParams(aSymbolID, aHref,
+                                        aAlign, aMeetOrSlice) {
+  var use = document.createElementNS(SVGNS, "use");
+  use.setAttributeNS(XLINKNS, "href", aHref);
+
+  var symbol = document.createElementNS(SVGNS, "symbol");
+  symbol.setAttribute("id", aSymbolID);
+  symbol.setAttribute("viewBox", "0 0 10 10");
+  symbol.setAttribute("preserveAspectRatio", aAlign + " " + aMeetOrSlice);
+
+  symbol.appendChild(use);
+  return symbol;
+}
+
+function generateUseElementForParams(aTargetURI, aX, aY, aWidth, aHeight) {
+  var use = document.createElementNS(SVGNS, "use");
+  use.setAttributeNS(XLINKNS, "href", aTargetURI);
+  use.setAttribute("x", aX);
+  use.setAttribute("y", aY);
+  use.setAttribute("width", aWidth);
+  use.setAttribute("height", aHeight);
+  return use;
+}
+
+// Returns a <g> element filled with a grid of <use> elements which each
+// have the specified aWidth & aHeight and which reference <symbol> elements
+// with all possible values of preserveAspectRatio.  Each <symbol> contains
+// a <use> that links to the given URI, aHref.
+//
+// The final "aBonusPARVal" argument (if specified) is used as the
+// preserveAspectRatio value on a bonus <symbol> element, added at the end.
+function generateSymbolGrid(aHref, aWidth, aHeight, aBonusPARVal) {
+  var grid = document.createElementNS(SVGNS, "g");
+  var y = 0;
+  var x = 0;
+  for (var i = 0; i < ALIGN_VALS.length; i++) {
+    // Jump to next line of grid, for every other "i" value.
+    // (every fourth entry)
+    if (i && i % 2 == 0) {
+      y += IMAGE_OFFSET;
+      x = 0;
+    }
+    var alignVal = ALIGN_VALS[i];
+    for (var j = 0; j < MEETORSLICE_VALS.length; j++) {
+      var meetorsliceVal = MEETORSLICE_VALS[j];
+      var border = generateBorderRect(x, y, aWidth, aHeight);
+
+      var symbolID = "symbol_" + alignVal + "_" + meetorsliceVal;
+      var symbol = generateSymbolElementForParams(symbolID, aHref,
+                                                  alignVal, meetorsliceVal);
+      var use = generateUseElementForParams("#" + symbolID,
+                                            x, y, aWidth, aHeight);
+      grid.appendChild(symbol); // This isn't painted
+      grid.appendChild(border);
+      grid.appendChild(use);
+      x += IMAGE_OFFSET;
+    }
+  }
+
+  if (aBonusPARVal) {
+    // Add one final entry with "bonus" pAR value.
+    y += IMAGE_OFFSET;
+    x = 0;
+    var border = generateBorderRect(x, y, aWidth, aHeight);
+    var symbolID = "symbol_Bonus";
+    var symbol = generateSymbolElementForParams(symbolID, aHref,
+                                                aBonusPARVal, "");
+    var use = generateUseElementForParams("#" + symbolID,
+                                          x, y, aWidth, aHeight);
+    grid.appendChild(symbol); // This isn't painted
+    grid.appendChild(border);
+    grid.appendChild(use);
+  }
+
+  return grid;
+}