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diff --git a/test/wpt/tests/resources/SVGAnimationTestCase-testharness.js b/test/wpt/tests/resources/SVGAnimationTestCase-testharness.js
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+// NOTE(edvardt):
+// This file is a slimmed down wrapper for the old SVGAnimationTestCase.js,
+// it has some convenience functions and should not be used for new tests.
+// New tests should not build on this API as it's just meant to keep things
+// working.
+
+// Helper functions
+const xlinkNS = "http://www.w3.org/1999/xlink"
+
+function expectFillColor(element, red, green, blue, message) {
+    let color = window.getComputedStyle(element, null).fill;
+    var re = new RegExp("rgba?\\(([^, ]*), ([^, ]*), ([^, ]*)(?:, )?([^, ]*)\\)");
+    rgb = re.exec(color);
+
+    assert_approx_equals(Number(rgb[1]), red, 2.0, message);
+    assert_approx_equals(Number(rgb[2]), green, 2.0, message);
+    assert_approx_equals(Number(rgb[3]), blue, 2.0, message);
+}
+
+function expectColor(element, red, green, blue, property) {
+    if (typeof property != "string")
+      color = getComputedStyle(element).getPropertyValue("color");
+    else
+      color = getComputedStyle(element).getPropertyValue(property);
+    var re = new RegExp("rgba?\\(([^, ]*), ([^, ]*), ([^, ]*)(?:, )?([^, ]*)\\)");
+    rgb = re.exec(color);
+    assert_approx_equals(Number(rgb[1]), red, 2.0);
+    assert_approx_equals(Number(rgb[2]), green, 2.0);
+    assert_approx_equals(Number(rgb[3]), blue, 2.0);
+}
+
+function createSVGElement(type) {
+  return document.createElementNS("http://www.w3.org/2000/svg", type);
+}
+
+// Inspired by Layoutests/animations/animation-test-helpers.js
+function moveAnimationTimelineAndSample(index) {
+    var animationId = expectedResults[index][0];
+    var time = expectedResults[index][1];
+    var sampleCallback = expectedResults[index][2];
+    var animation = rootSVGElement.ownerDocument.getElementById(animationId);
+
+    // If we want to sample the animation end, add a small delta, to reliable point past the end of the animation.
+    newTime = time;
+
+    // The sample time is relative to the start time of the animation, take that into account.
+    rootSVGElement.setCurrentTime(newTime);
+
+    // NOTE(edvardt):
+    // This is a dumb hack, some of the old tests sampled before the animation start, this
+    // isn't technically part of the animation tests and is "impossible" to translate since
+    // tests start automatically. Thus I solved it by skipping it.
+    if (time != 0.0)
+        sampleCallback();
+}
+
+var currentTest = 0;
+var expectedResults;
+
+function sampleAnimation(t) {
+    if (currentTest == expectedResults.length) {
+        t.done();
+        return;
+    }
+
+    moveAnimationTimelineAndSample(currentTest);
+    ++currentTest;
+
+    step_timeout(t.step_func(function () { sampleAnimation(t); }), 0);
+}
+
+function runAnimationTest(t, expected) {
+    if (!expected)
+        throw("Expected results are missing!");
+    if (currentTest > 0)
+        throw("Not allowed to call runAnimationTest() twice");
+
+    expectedResults = expected;
+    testCount = expectedResults.length;
+    currentTest = 0;
+
+    step_timeout(t.step_func(function () { sampleAnimation(this); }), 50);
+}
+
+function smil_async_test(func) {
+  async_test(t => {
+    window.onload = t.step_func(function () {
+      // Pause animations, we'll drive them manually.
+      // This also ensures that the timeline is paused before
+      // it starts. This should make the instance time of the below
+      // 'click' (for instance) 0, and hence minimize rounding
+      // errors for the addition in moveAnimationTimelineAndSample.
+      rootSVGElement.pauseAnimations();
+
+      // If eg. an animation is running with begin="0s", and
+      // we want to sample the first time, before the animation
+      // starts, then we can't delay the testing by using an
+      // onclick event, as the animation would be past start time.
+      func(t);
+    });
+  });
+}