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diff --git a/layout/reftests/svg/smil/smil-grid.js b/layout/reftests/svg/smil/smil-grid.js
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+++ b/layout/reftests/svg/smil/smil-grid.js
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+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set ts=2 sw=2 sts=2 et: */
+/* 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/. */
+
+/* Javascript library for dynamically generating a simple SVG/SMIL reftest
+ * with several copies of the same animation, each seeked to a different time.
+ */
+
+// Global variables
+const START_TIMES = [ "4.0s",  "3.0s",  "2.7s",
+                      "2.25s", "2.01s", "1.5s",
+                      "1.4s",  "1.0s",  "0.5s" ];
+
+const X_POSNS = [ "20px",  "70px",  "120px",
+                  "20px",  "70px",  "120px",
+                  "20px",  "70px",  "120px" ];
+
+const Y_POSNS = [ "20px",  "20px",  "20px",
+                  "70px",  "70px",  "70px",
+                 "120px", "120px", "120px"  ];
+
+const DURATION = "2s";
+const SNAPSHOT_TIME ="3";
+const SVGNS = "http://www.w3.org/2000/svg";
+
+// Convenience wrapper using testAnimatedGrid to make 15pt-by-15pt rects
+function testAnimatedRectGrid(animationTagName, animationAttrHashList) {
+  var targetTagName = "rect";
+  var targetAttrHash = {"width"  : "15px",
+                        "height" : "15px" };
+  testAnimatedGrid(targetTagName,    targetAttrHash,
+                   animationTagName, animationAttrHashList);
+}
+
+// Convenience wrapper using testAnimatedGrid to make grid of text
+function testAnimatedTextGrid(animationTagName, animationAttrHashList) {
+  var targetTagName = "text";
+  var targetAttrHash = { };
+  testAnimatedGrid(targetTagName,    targetAttrHash,
+                   animationTagName, animationAttrHashList);
+}
+
+// Generates a visual grid of elements of type "targetTagName", with the
+// attribute values given in targetAttrHash.  Each generated element has
+// exactly one child -- an animation element of type "animationTagName", with
+// the attribute values given in animationAttrHash.
+function testAnimatedGrid(targetTagName,    targetAttrHash,
+                          animationTagName, animationAttrHashList) {
+    // SANITY CHECK
+  const numElementsToMake = START_TIMES.length;
+  if (X_POSNS.length != numElementsToMake ||
+      Y_POSNS.length != numElementsToMake) {
+    return;
+  }
+
+  for (var i = 0; i < animationAttrHashList.length; i++) {
+    var animationAttrHash = animationAttrHashList[i];
+    // Default to fill="freeze" so we can test the final value of the animation
+    if (!animationAttrHash["fill"]) {
+      animationAttrHash["fill"] = "freeze";
+    }
+  }
+
+  // Build the grid!
+  var svg = document.documentElement;
+  for (var i = 0; i < numElementsToMake; i++) {
+    // Build target & animation elements
+    var targetElem = buildElement(targetTagName, targetAttrHash);
+    for (var j = 0; j < animationAttrHashList.length; j++) {
+      var animationAttrHash = animationAttrHashList[j];
+      var animElem = buildElement(animationTagName, animationAttrHash);
+
+      // Customize them using global constant values
+      targetElem.setAttribute("x", X_POSNS[i]);
+      targetElem.setAttribute("y", Y_POSNS[i]);
+      animElem.setAttribute("begin", START_TIMES[i]);
+      animElem.setAttribute("dur", DURATION);
+
+      // Append to target
+      targetElem.appendChild(animElem);
+    }
+    // Insert target into DOM
+    svg.appendChild(targetElem);
+  }
+
+  // Take snapshot
+  setTimeAndSnapshot(SNAPSHOT_TIME, true);
+}
+
+// Generates a visual grid of elements of type |graphicElemTagName|, with the
+// attribute values given in |graphicElemAttrHash|. This is a variation of the
+// above function. We use <defs> to include the reference elements because
+// some animatable properties are only applicable to some specific elements
+// (e.g. feFlood, stop), so then we apply an animation element of type
+// |animationTagName|, with the attribute values given in |animationAttrHash|,
+// to those specific elements. |defTagNameList| is an array of tag names.
+// We will create elements hierarchically according to this array. The first tag
+// in |defTagNameList| is the outer-most one in <defs>, and the last tag is the
+// inner-most one and it is the target to which the animation element will be
+// applied. We visualize the effect of our animation by referencing each
+// animated subtree from some graphical element that we generate. The
+// |graphicElemIdValueProperty| parameter provides the name of the CSS property
+// that we should use to hook up this reference.
+//
+// e.g. if a caller passes a defTagNameList of [ "linearGradient", "stop" ],
+//      this function will generate the following subtree:
+// <defs>
+//   <linearGradient id="elem0">
+//     <stop>
+//       <animate ..../>
+//     </stop>
+//   </linearGradient>
+//   <linearGradient id="elem1">
+//     <stop>
+//       <animate ..../>
+//     </stop>
+//   </linearGradient>
+//
+//   <!--- more similar linearGradients here, up to START_TIMES.length -->
+// </defs>
+function testAnimatedGridWithDefs(graphicElemTagName,
+                                  graphicElemAttrHash,
+                                  graphicElemIdValuedProperty,
+                                  defTagNameList,
+                                  animationTagName,
+                                  animationAttrHashList) {
+  // SANITY CHECK
+  const numElementsToMake = START_TIMES.length;
+  if (X_POSNS.length != numElementsToMake ||
+      Y_POSNS.length != numElementsToMake) {
+    return;
+  }
+
+  if (defTagNameList.length == 0) {
+    return;
+  }
+
+  for (var i = 0; i < animationAttrHashList.length; i++) {
+    var animationAttrHash = animationAttrHashList[i];
+    // Default to fill="freeze" so we can test the final value of the animation
+    if (!animationAttrHash["fill"]) {
+      animationAttrHash["fill"] = "freeze";
+    }
+  }
+
+  var svg = document.documentElement;
+
+  // Build defs element.
+  var defs = buildElement('defs');
+  for (var i = 0; i < numElementsToMake; i++) {
+    // This will track the innermost element in our subtree:
+    var innerElement = defs;
+
+    for (var defIdx = 0; defIdx < defTagNameList.length; ++defIdx) {
+      // Set an ID on the first level of nesting (on child of defs):
+      var attrs = defIdx == 0 ? { "id": "elem" + i } : {};
+
+      var newElem = buildElement(defTagNameList[defIdx], attrs);
+      innerElement.appendChild(newElem);
+      innerElement = newElem;
+    }
+
+    for (var j = 0; j < animationAttrHashList.length; ++j) {
+      var animationAttrHash = animationAttrHashList[j];
+      var animElem = buildElement(animationTagName, animationAttrHash);
+      animElem.setAttribute("begin", START_TIMES[i]);
+      animElem.setAttribute("dur", DURATION);
+      innerElement.appendChild(animElem);
+    }
+  }
+  svg.appendChild(defs);
+
+  // Build the grid!
+  for (var i = 0; i < numElementsToMake; ++i) {
+    var graphicElem = buildElement(graphicElemTagName, graphicElemAttrHash);
+    graphicElem.setAttribute("x", X_POSNS[i]);
+    graphicElem.setAttribute("y", Y_POSNS[i]);
+    graphicElem.setAttribute("style", graphicElemIdValuedProperty +
+                                      ":url(#elem" + i + ")");
+    svg.appendChild(graphicElem);
+  }
+
+  // Take snapshot
+  setTimeAndSnapshot(SNAPSHOT_TIME, true);
+}
+
+function buildElement(tagName, attrHash) {
+  var elem = document.createElementNS(SVGNS, tagName);
+  for (var attrName in attrHash) {
+    var attrValue = attrHash[attrName];
+    elem.setAttribute(attrName, attrValue);
+  }
+  // If we're creating a text node, populate it with some text.
+  if (tagName == "text") {
+    elem.appendChild(document.createTextNode("abc"));
+  }
+  return elem;
+}