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diff --git a/testing/web-platform/tests/web-animations/testcommon.js b/testing/web-platform/tests/web-animations/testcommon.js
new file mode 100644
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+++ b/testing/web-platform/tests/web-animations/testcommon.js
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+'use strict';
+
+const MS_PER_SEC = 1000;
+
+// The recommended minimum precision to use for time values[1].
+//
+// [1] https://drafts.csswg.org/web-animations/#precision-of-time-values
+const TIME_PRECISION = 0.0005; // ms
+
+// Allow implementations to substitute an alternative method for comparing
+// times based on their precision requirements.
+if (!window.assert_times_equal) {
+  window.assert_times_equal = (actual, expected, description) => {
+    assert_approx_equals(actual, expected, TIME_PRECISION * 2, description);
+  };
+}
+
+// Allow implementations to substitute an alternative method for comparing
+// times based on their precision requirements.
+if (!window.assert_time_greater_than_equal) {
+ window.assert_time_greater_than_equal = (actual, expected, description) => {
+    assert_greater_than_equal(actual, expected - 2 * TIME_PRECISION,
+                              description);
+  };
+}
+
+// Allow implementations to substitute an alternative method for comparing
+// a time value based on its precision requirements with a fixed value.
+if (!window.assert_time_equals_literal) {
+  window.assert_time_equals_literal = (actual, expected, description) => {
+    if (Math.abs(expected) === Infinity) {
+      assert_equals(actual, expected, description);
+    } else {
+      assert_approx_equals(actual, expected, TIME_PRECISION, description);
+    }
+  }
+}
+
+// creates div element, appends it to the document body and
+// removes the created element during test cleanup
+function createDiv(test, doc) {
+  return createElement(test, 'div', doc);
+}
+
+// creates element of given tagName, appends it to the document body and
+// removes the created element during test cleanup
+// if tagName is null or undefined, returns div element
+function createElement(test, tagName, doc) {
+  if (!doc) {
+    doc = document;
+  }
+  const element = doc.createElement(tagName || 'div');
+  doc.body.appendChild(element);
+  test.add_cleanup(() => {
+    element.remove();
+  });
+  return element;
+}
+
+// Creates a style element with the specified rules, appends it to the document
+// head and removes the created element during test cleanup.
+// |rules| is an object. For example:
+// { '@keyframes anim': '' ,
+//   '.className': 'animation: anim 100s;' };
+// or
+// { '.className1::before': 'content: ""; width: 0px; transition: all 10s;',
+//   '.className2::before': 'width: 100px;' };
+// The object property name could be a keyframes name, or a selector.
+// The object property value is declarations which are property:value pairs
+// split by a space.
+function createStyle(test, rules, doc) {
+  if (!doc) {
+    doc = document;
+  }
+  const extraStyle = doc.createElement('style');
+  doc.head.appendChild(extraStyle);
+  if (rules) {
+    const sheet = extraStyle.sheet;
+    for (const selector in rules) {
+      sheet.insertRule(`${selector}{${rules[selector]}}`,
+                       sheet.cssRules.length);
+    }
+  }
+  test.add_cleanup(() => {
+    extraStyle.remove();
+  });
+}
+
+// Cubic bezier with control points (0, 0), (x1, y1), (x2, y2), and (1, 1).
+function cubicBezier(x1, y1, x2, y2) {
+  const xForT = t => {
+    const omt = 1-t;
+    return 3 * omt * omt * t * x1 + 3 * omt * t * t * x2 + t * t * t;
+  };
+
+  const yForT = t => {
+    const omt = 1-t;
+    return 3 * omt * omt * t * y1 + 3 * omt * t * t * y2 + t * t * t;
+  };
+
+  const tForX = x => {
+    // Binary subdivision.
+    let mint = 0, maxt = 1;
+    for (let i = 0; i < 30; ++i) {
+      const guesst = (mint + maxt) / 2;
+      const guessx = xForT(guesst);
+      if (x < guessx) {
+        maxt = guesst;
+      } else {
+        mint = guesst;
+      }
+    }
+    return (mint + maxt) / 2;
+  };
+
+  return x => {
+    if (x == 0) {
+      return 0;
+    }
+    if (x == 1) {
+      return 1;
+    }
+    return yForT(tForX(x));
+  };
+}
+
+function stepEnd(nsteps) {
+  return x => Math.floor(x * nsteps) / nsteps;
+}
+
+function stepStart(nsteps) {
+  return x => {
+    const result = Math.floor(x * nsteps + 1.0) / nsteps;
+    return (result > 1.0) ? 1.0 : result;
+  };
+}
+
+function waitForAnimationFrames(frameCount) {
+  return new Promise(resolve => {
+    function handleFrame() {
+      if (--frameCount <= 0) {
+        resolve();
+      } else {
+        window.requestAnimationFrame(handleFrame); // wait another frame
+      }
+    }
+    window.requestAnimationFrame(handleFrame);
+  });
+}
+
+// Continually calls requestAnimationFrame until |minDelay| has elapsed
+// as recorded using document.timeline.currentTime (i.e. frame time not
+// wall-clock time).
+function waitForAnimationFramesWithDelay(minDelay) {
+  const startTime = document.timeline.currentTime;
+  return new Promise(resolve => {
+    (function handleFrame() {
+      if (document.timeline.currentTime - startTime >= minDelay) {
+        resolve();
+      } else {
+        window.requestAnimationFrame(handleFrame);
+      }
+    }());
+  });
+}
+
+
+// Waits for a requestAnimationFrame callback in the next refresh driver tick.
+function waitForNextFrame() {
+  const timeAtStart = document.timeline.currentTime;
+  return new Promise(resolve => {
+   (function handleFrame() {
+    if (timeAtStart === document.timeline.currentTime) {
+      window.requestAnimationFrame(handleFrame);
+    } else {
+      resolve();
+    }
+  }());
+  });
+}
+
+async function insertFrameAndAwaitLoad(test, iframe, doc) {
+  const eventWatcher = new EventWatcher(test, iframe, ['load']);
+  const event_promise = eventWatcher.wait_for('load');
+
+  doc.body.appendChild(iframe);
+  test.add_cleanup(() => { doc.body.removeChild(iframe); });
+
+  await event_promise;
+}
+
+// Returns 'matrix()' or 'matrix3d()' function string generated from an array.
+function createMatrixFromArray(array) {
+  return (array.length == 16 ? 'matrix3d' : 'matrix') + `(${array.join()})`;
+}
+
+// Returns 'matrix3d()' function string equivalent to
+// 'rotate3d(x, y, z, radian)'.
+function rotate3dToMatrix3d(x, y, z, radian) {
+  return createMatrixFromArray(rotate3dToMatrix(x, y, z, radian));
+}
+
+// Returns an array of the 4x4 matrix equivalent to 'rotate3d(x, y, z, radian)'.
+// https://drafts.csswg.org/css-transforms-2/#Rotate3dDefined
+function rotate3dToMatrix(x, y, z, radian) {
+  const sc = Math.sin(radian / 2) * Math.cos(radian / 2);
+  const sq = Math.sin(radian / 2) * Math.sin(radian / 2);
+
+  // Normalize the vector.
+  const length = Math.sqrt(x*x + y*y + z*z);
+  x /= length;
+  y /= length;
+  z /= length;
+
+  return [
+    1 - 2 * (y*y + z*z) * sq,
+    2 * (x * y * sq + z * sc),
+    2 * (x * z * sq - y * sc),
+    0,
+    2 * (x * y * sq - z * sc),
+    1 - 2 * (x*x + z*z) * sq,
+    2 * (y * z * sq + x * sc),
+    0,
+    2 * (x * z * sq + y * sc),
+    2 * (y * z * sq - x * sc),
+    1 - 2 * (x*x + y*y) * sq,
+    0,
+    0,
+    0,
+    0,
+    1
+  ];
+}
+
+// Compare matrix string like 'matrix(1, 0, 0, 1, 100, 0)' with tolerances.
+function assert_matrix_equals(actual, expected, description) {
+  const matrixRegExp = /^matrix(?:3d)*\((.+)\)/;
+  assert_regexp_match(actual, matrixRegExp,
+    'Actual value is not a matrix')
+  assert_regexp_match(expected, matrixRegExp,
+    'Expected value is not a matrix');
+
+  const actualMatrixArray =
+    actual.match(matrixRegExp)[1].split(',').map(Number);
+  const expectedMatrixArray =
+    expected.match(matrixRegExp)[1].split(',').map(Number);
+
+  assert_equals(actualMatrixArray.length, expectedMatrixArray.length,
+    `dimension of the matrix: ${description}`);
+  for (let i = 0; i < actualMatrixArray.length; i++) {
+    assert_approx_equals(actualMatrixArray[i], expectedMatrixArray[i], 0.0001,
+      `expected ${expected} but got ${actual}: ${description}`);
+  }
+}
+
+// Compare rotate3d vector like '0 1 0 45deg' with tolerances.
+function assert_rotate3d_equals(actual, expected, description) {
+  const rotationRegExp =/^((([+-]?\d+(\.+\d+)?\s){3})?\d+(\.+\d+)?)deg/;
+
+  assert_regexp_match(actual, rotationRegExp,
+    'Actual value is not a rotate3d vector')
+  assert_regexp_match(expected, rotationRegExp,
+    'Expected value is not a rotate3d vector');
+
+  const actualRotationVector =
+    actual.match(rotationRegExp)[1].split(' ').map(Number);
+  const expectedRotationVector =
+    expected.match(rotationRegExp)[1].split(' ').map(Number);
+
+  assert_equals(actualRotationVector.length, expectedRotationVector.length,
+                `dimension of the matrix: ${description}`);
+  for (let i = 0; i < actualRotationVector.length; i++) {
+    assert_approx_equals(
+        actualRotationVector[i],
+        expectedRotationVector[i],
+        0.0001,
+        `expected ${expected} but got ${actual}: ${description}`);
+  }
+}
+
+function assert_phase_at_time(animation, phase, currentTime) {
+  animation.currentTime = currentTime;
+  const fillMode = animation.effect.getTiming().fill;
+
+  if (phase === 'active') {
+    // If the fill mode is 'none', then progress will only be non-null if we
+    // are in the active phase.
+    animation.effect.updateTiming({ fill: 'none' });
+    assert_not_equals(animation.effect.getComputedTiming().progress, null,
+                      'Animation effect is in active phase when current time ' +
+                      `is ${currentTime}.`);
+  } else {
+    // The easiest way to distinguish between the 'before' phase and the 'after'
+    // phase is to toggle the fill mode. For example, if the progress is null
+    // when the fill mode is 'none' but non-null when the fill mode is
+    // 'backwards' then we are in the before phase.
+    animation.effect.updateTiming({ fill: 'none' });
+    assert_equals(animation.effect.getComputedTiming().progress, null,
+                  `Animation effect is in ${phase} phase when current time ` +
+                  `is ${currentTime} (progress is null with 'none' fill mode)`);
+
+    animation.effect.updateTiming({
+      fill: phase === 'before' ? 'backwards' : 'forwards',
+    });
+    assert_not_equals(animation.effect.getComputedTiming().progress, null,
+                      `Animation effect is in ${phase} phase when current ` +
+                      `time is ${currentTime} (progress is non-null with ` +
+                      `appropriate fill mode)`);
+  }
+
+  // Reset fill mode to avoid side-effects.
+  animation.effect.updateTiming({ fill: fillMode });
+}
+
+
+// Use with reftest-wait to wait until compositor commits are no longer deferred
+// before taking the screenshot.
+// crbug.com/1378671
+async function waitForCompositorReady(target) {
+  const animation =
+      document.body.animate({ opacity: [ 1, 1 ] }, {duration: 1 });
+  return animation.finished;
+}