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diff --git a/dom/smil/test/db_smilCSSFromBy.js b/dom/smil/test/db_smilCSSFromBy.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/. */
+
+/* testcase data for simple "from-by" animations of CSS properties */
+
+// NOTE: This js file requires db_smilCSSPropertyList.js
+
+// Lists of testcases for re-use across multiple properties of the same type
+var _fromByTestLists = {
+  color: [
+    new AnimTestcaseFromBy("rgb(10, 20, 30)", "currentColor", {
+      midComp: "rgb(35, 45, 55)",
+      toComp: "rgb(60, 70, 80)",
+    }),
+    new AnimTestcaseFromBy("currentColor", "rgb(30, 20, 10)", {
+      fromComp: "rgb(50, 50, 50)",
+      midComp: "rgb(65, 60, 55)",
+      toComp: "rgb(80, 70, 60)",
+    }),
+    new AnimTestcaseFromBy(
+      "rgba(10, 20, 30, 0.2)",
+      "rgba(50, 50, 50, 1)",
+      // (rgb(10, 20, 30) * 0.2 * 0.5 + rgb(52, 54, 56) * 1.0 * 0.5) * (1 / 0.6)
+      {
+        midComp: "rgba(45, 48, 52, 0.6)",
+        // (rgb(10, 20, 30) * 0.2 + rgb(50, 50, 50) * 1) / 1.0
+        toComp: "rgb(52, 54, 56)",
+      }
+    ),
+
+    // The "from" and "by" values in the test case below overflow the maxium
+    // color-channel values when added together.
+    // (e.g. for red [ignoring alpha for now], 100 + 240 = 340 which is > 255)
+    //
+    // The SVG Animation spec says we should clamp color values "as late as
+    // possible" i.e. allow the channel overflow and clamp at paint-time.
+    //
+    // That gives us:
+    //
+    //   to-value = (rgb(100, 100, 100) * 0.6 + rgb(240, 240, 240) * 1.0)) * 1
+    //            = rgb(300, 300, 300)
+    //   midComp  = (rgb(100, 100, 100) * 0.6 * 0.5 + rgb(300, 300, 300) * 1.0 * 0.5) * (1 / 0.8)
+    //            = rgb(225, 225, 225)
+    //
+    //
+    new AnimTestcaseFromBy(
+      "rgba(100, 100, 100, 0.6)",
+      "rgba(240, 240, 240, 1)",
+      { midComp: "rgba(225, 225, 225, 0.8)", toComp: "rgb(255, 255, 255)" }
+    ),
+  ],
+  lengthNoUnits: [
+    new AnimTestcaseFromBy("0", "50", {
+      fromComp: "0px", // 0 acts like 0px
+      midComp: "25px",
+      toComp: "50px",
+    }),
+    new AnimTestcaseFromBy("30", "10", {
+      fromComp: "30px",
+      midComp: "35px",
+      toComp: "40px",
+    }),
+  ],
+  lengthPx: [
+    new AnimTestcaseFromBy("0px", "8px", {
+      fromComp: "0px",
+      midComp: "4px",
+      toComp: "8px",
+    }),
+    new AnimTestcaseFromBy("1px", "10px", {
+      fromComp: "1px",
+      midComp: "6px",
+      toComp: "11px",
+    }),
+  ],
+  opacity: [
+    new AnimTestcaseFromBy("1", "-1", { midComp: "0.5", toComp: "0" }),
+    new AnimTestcaseFromBy("0.4", "-0.6", { midComp: "0.1", toComp: "0" }),
+    new AnimTestcaseFromBy(
+      "0.8",
+      "-1.4",
+      { midComp: "0.1", toComp: "0" },
+      "opacities with abs val >1 get clamped too early"
+    ),
+    new AnimTestcaseFromBy(
+      "1.2",
+      "-0.6",
+      { midComp: "0.9", toComp: "0.6" },
+      "opacities with abs val >1 get clamped too early"
+    ),
+  ],
+  paint: [
+    // The "none" keyword & URI values aren't addiditve, so the animations in
+    // these testcases are expected to have no effect.
+    new AnimTestcaseFromBy("none", "none", { noEffect: 1 }),
+    new AnimTestcaseFromBy("url(#gradA)", "url(#gradB)", { noEffect: 1 }),
+    new AnimTestcaseFromBy("url(#gradA)", "url(#gradB) red", { noEffect: 1 }),
+    new AnimTestcaseFromBy("url(#gradA)", "none", { noEffect: 1 }),
+    new AnimTestcaseFromBy("red", "url(#gradA)", { noEffect: 1 }),
+  ],
+  URIsAndNone: [
+    // No need to specify { noEffect: 1 }, since plain URI-valued properties
+    // aren't additive
+    new AnimTestcaseFromBy("url(#idA)", "url(#idB)"),
+    new AnimTestcaseFromBy("none", "url(#idB)"),
+    new AnimTestcaseFromBy("url(#idB)", "inherit"),
+  ],
+};
+
+// List of attribute/testcase-list bundles to be tested
+var gFromByBundles = [
+  new TestcaseBundle(gPropList.clip, [
+    new AnimTestcaseFromBy(
+      "rect(1px, 2px, 3px, 4px)",
+      "rect(10px, 20px, 30px, 40px)",
+      {
+        midComp: "rect(6px, 12px, 18px, 24px)",
+        toComp: "rect(11px, 22px, 33px, 44px)",
+      }
+    ),
+    // Adding "auto" (either as a standalone value or a subcomponent value)
+    // should cause animation to fail.
+    new AnimTestcaseFromBy("auto", "auto", { noEffect: 1 }),
+    new AnimTestcaseFromBy("auto", "rect(auto, auto, auto, auto)", {
+      noEffect: 1,
+    }),
+    new AnimTestcaseFromBy(
+      "rect(auto, auto, auto, auto)",
+      "rect(auto, auto, auto, auto)",
+      { noEffect: 1 }
+    ),
+    new AnimTestcaseFromBy("rect(1px, 2px, 3px, 4px)", "auto", { noEffect: 1 }),
+    new AnimTestcaseFromBy("auto", "rect(1px, 2px, 3px, 4px)", { noEffect: 1 }),
+    new AnimTestcaseFromBy(
+      "rect(1px, 2px, 3px, auto)",
+      "rect(10px, 20px, 30px, 40px)",
+      { noEffect: 1 }
+    ),
+    new AnimTestcaseFromBy(
+      "rect(1px, auto, 3px, 4px)",
+      "rect(10px, auto, 30px, 40px)",
+      { noEffect: 1 }
+    ),
+    new AnimTestcaseFromBy(
+      "rect(1px, 2px, 3px, 4px)",
+      "rect(10px, auto, 30px, 40px)",
+      { noEffect: 1 }
+    ),
+  ]),
+  // Check that 'by' animations for 'cursor' has no effect
+  new TestcaseBundle(gPropList.cursor, [
+    new AnimTestcaseFromBy("crosshair", "move"),
+  ]),
+  new TestcaseBundle(
+    gPropList.fill,
+    [].concat(_fromByTestLists.color, _fromByTestLists.paint)
+  ),
+  // Check that 'by' animations involving URIs have no effect
+  new TestcaseBundle(gPropList.filter, _fromByTestLists.URIsAndNone),
+  new TestcaseBundle(gPropList.font, [
+    new AnimTestcaseFromBy(
+      "10px serif",
+      "normal normal 400 100px / 10px monospace"
+    ),
+  ]),
+  new TestcaseBundle(
+    gPropList.font_size,
+    [].concat(_fromByTestLists.lengthNoUnits, _fromByTestLists.lengthPx)
+  ),
+  new TestcaseBundle(gPropList.font_size_adjust, [
+    // These testcases implicitly have no effect, because font-size-adjust is
+    // non-additive (and is declared as such in db_smilCSSPropertyList.js)
+    new AnimTestcaseFromBy("0.5", "0.1"),
+    new AnimTestcaseFromBy("none", "0.1"),
+    new AnimTestcaseFromBy("0.1", "none"),
+  ]),
+  // Bug 1457353: Change from nsColor to StyleComplexColor causes addition
+  // with currentcolor to break. Bug 1465307 for work to re-enable.
+  new TestcaseBundle(gPropList.lighting_color, _fromByTestLists.color),
+  new TestcaseBundle(gPropList.marker, _fromByTestLists.URIsAndNone),
+  new TestcaseBundle(gPropList.marker_end, _fromByTestLists.URIsAndNone),
+  new TestcaseBundle(gPropList.marker_mid, _fromByTestLists.URIsAndNone),
+  new TestcaseBundle(gPropList.marker_start, _fromByTestLists.URIsAndNone),
+  new TestcaseBundle(gPropList.overflow, [
+    new AnimTestcaseFromBy("inherit", "auto"),
+    new AnimTestcaseFromBy("scroll", "hidden"),
+  ]),
+  new TestcaseBundle(gPropList.opacity, _fromByTestLists.opacity),
+  new TestcaseBundle(gPropList.stroke_miterlimit, [
+    new AnimTestcaseFromBy("1", "1", { midComp: "1.5", toComp: "2" }),
+    new AnimTestcaseFromBy("20.1", "-10", { midComp: "15.1", toComp: "10.1" }),
+  ]),
+  new TestcaseBundle(gPropList.stroke_dasharray, [
+    // These testcases implicitly have no effect, because stroke-dasharray is
+    // non-additive (and is declared as such in db_smilCSSPropertyList.js)
+    new AnimTestcaseFromBy("none", "5"),
+    new AnimTestcaseFromBy("10", "5"),
+    new AnimTestcaseFromBy("1", "2, 3"),
+  ]),
+  new TestcaseBundle(
+    gPropList.stroke_width,
+    [].concat(_fromByTestLists.lengthNoUnits, _fromByTestLists.lengthPx)
+  ),
+];