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+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Animatable.animate</title>
+<link rel="help" href="https://drafts.csswg.org/web-animations/#dom-animatable-animate">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../../testcommon.js"></script>
+<script src="../../resources/easing-tests.js"></script>
+<script src="../../resources/keyframe-utils.js"></script>
+<script src="../../resources/keyframe-tests.js"></script>
+<script src="../../resources/timing-utils.js"></script>
+<script src="../../resources/timing-tests.js"></script>
+<style>
+.pseudo::before {content: '';}
+.pseudo::after {content: '';}
+.pseudo::marker {content: '';}
+</style>
+<body>
+<div id="log"></div>
+<iframe width="10" height="10" id="iframe"></iframe>
+<script>
+'use strict';
+
+// Tests on Element
+
+test(t => {
+  const anim = createDiv(t).animate(null);
+  assert_class_string(anim, 'Animation', 'Returned object is an Animation');
+}, 'Element.animate() creates an Animation object');
+
+test(t => {
+  const iframe = window.frames[0];
+  const div = createDiv(t, iframe.document);
+  const anim = Element.prototype.animate.call(div, null);
+  assert_equals(Object.getPrototypeOf(anim), iframe.Animation.prototype,
+                'The prototype of the created Animation is that defined on'
+                + ' the relevant global for the target element');
+  assert_not_equals(Object.getPrototypeOf(anim), Animation.prototype,
+                    'The prototype of the created Animation is NOT that of'
+                    + ' the current global');
+}, 'Element.animate() creates an Animation object in the relevant realm of'
+   + ' the target element');
+
+test(t => {
+  const div = createDiv(t);
+  const anim = Element.prototype.animate.call(div, null);
+  assert_class_string(anim.effect, 'KeyframeEffect',
+                      'Returned Animation has a KeyframeEffect');
+}, 'Element.animate() creates an Animation object with a KeyframeEffect');
+
+test(t => {
+  const iframe = window.frames[0];
+  const div = createDiv(t, iframe.document);
+  const anim = Element.prototype.animate.call(div, null);
+  assert_equals(Object.getPrototypeOf(anim.effect),
+                iframe.KeyframeEffect.prototype,
+                'The prototype of the created KeyframeEffect is that defined on'
+                + ' the relevant global for the target element');
+  assert_not_equals(Object.getPrototypeOf(anim.effect),
+                    KeyframeEffect.prototype,
+                    'The prototype of the created KeyframeEffect is NOT that of'
+                    + ' the current global');
+}, 'Element.animate() creates an Animation object with a KeyframeEffect'
+   + ' that is created in the relevant realm of the target element');
+
+for (const subtest of gEmptyKeyframeListTests) {
+  test(t => {
+    const anim = createDiv(t).animate(subtest, 2000);
+    assert_not_equals(anim, null);
+  }, 'Element.animate() accepts empty keyframe lists ' +
+     `(input: ${JSON.stringify(subtest)})`);
+}
+
+for (const subtest of gKeyframesTests) {
+  test(t => {
+    const anim = createDiv(t).animate(subtest.input, 2000);
+    assert_frame_lists_equal(anim.effect.getKeyframes(), subtest.output);
+  }, `Element.animate() accepts ${subtest.desc}`);
+}
+
+for (const subtest of gInvalidKeyframesTests) {
+  test(t => {
+    const div = createDiv(t);
+    assert_throws_js(TypeError, () => {
+      div.animate(subtest.input, 2000);
+    });
+  }, `Element.animate() does not accept ${subtest.desc}`);
+}
+
+test(t => {
+  const anim = createDiv(t).animate(null, 2000);
+  assert_equals(anim.effect.getTiming().duration, 2000);
+  assert_default_timing_except(anim.effect, ['duration']);
+}, 'Element.animate() accepts a double as an options argument');
+
+test(t => {
+  const anim = createDiv(t).animate(null,
+                                    { duration: Infinity, fill: 'forwards' });
+  assert_equals(anim.effect.getTiming().duration, Infinity);
+  assert_equals(anim.effect.getTiming().fill, 'forwards');
+  assert_default_timing_except(anim.effect, ['duration', 'fill']);
+}, 'Element.animate() accepts a KeyframeAnimationOptions argument');
+
+test(t => {
+  const anim = createDiv(t).animate(null);
+  assert_default_timing_except(anim.effect, []);
+}, 'Element.animate() accepts an absent options argument');
+
+for (const invalid of gBadDelayValues) {
+  test(t => {
+    assert_throws_js(TypeError, () => {
+      createDiv(t).animate(null, { delay: invalid });
+    });
+  }, `Element.animate() does not accept invalid delay value: ${invalid}`);
+}
+
+test(t => {
+  const anim = createDiv(t).animate(null, { duration: 'auto' });
+  assert_equals(anim.effect.getTiming().duration, 'auto', 'set duration \'auto\'');
+  assert_equals(anim.effect.getComputedTiming().duration, 0,
+                'getComputedTiming() after set duration \'auto\'');
+}, 'Element.animate() accepts a duration of \'auto\' using a dictionary'
+   + ' object');
+
+for (const invalid of gBadDurationValues) {
+  if (typeof invalid === 'string' && !isNaN(parseFloat(invalid))) {
+    continue;
+  }
+  test(t => {
+    assert_throws_js(TypeError, () => {
+      createDiv(t).animate(null, invalid);
+    });
+  }, 'Element.animate() does not accept invalid duration value: '
+     + (typeof invalid === 'string' ? `"${invalid}"` : invalid));
+}
+
+for (const invalid of gBadDurationValues) {
+  test(t => {
+    assert_throws_js(TypeError, () => {
+      createDiv(t).animate(null, { duration: invalid });
+    });
+  }, 'Element.animate() does not accept invalid duration value: '
+     + (typeof invalid === 'string' ? `"${invalid}"` : invalid)
+     + ' using a dictionary object');
+}
+
+for (const invalidEasing of gInvalidEasings) {
+  test(t => {
+    assert_throws_js(TypeError, () => {
+      createDiv(t).animate({ easing: invalidEasing }, 2000);
+    });
+  }, `Element.animate() does not accept invalid easing: '${invalidEasing}'`);
+}
+
+for (const invalid of gBadIterationStartValues) {
+  test(t => {
+    assert_throws_js(TypeError, () => {
+      createDiv(t).animate(null, { iterationStart: invalid });
+    });
+  }, 'Element.animate() does not accept invalid iterationStart value: ' +
+     invalid);
+}
+
+for (const invalid of gBadIterationsValues) {
+  test(t => {
+    assert_throws_js(TypeError, () => {
+      createDiv(t).animate(null, { iterations: invalid });
+    });
+  }, 'Element.animate() does not accept invalid iterations value: ' +
+     invalid);
+}
+
+test(t => {
+  const anim = createDiv(t).animate(null, 2000);
+  assert_equals(anim.id, '');
+}, 'Element.animate() correctly sets the id attribute when no id is specified');
+
+test(t => {
+  const anim = createDiv(t).animate(null, { id: 'test' });
+  assert_equals(anim.id, 'test');
+}, 'Element.animate() correctly sets the id attribute');
+
+test(t => {
+  const anim = createDiv(t).animate(null, 2000);
+  assert_equals(anim.timeline, document.timeline);
+}, 'Element.animate() correctly sets the Animation\'s timeline');
+
+async_test(t => {
+  const iframe = document.createElement('iframe');
+  iframe.width = 10;
+  iframe.height = 10;
+
+  iframe.addEventListener('load', t.step_func(() => {
+    const div = createDiv(t, iframe.contentDocument);
+    const anim = div.animate(null, 2000);
+    assert_equals(anim.timeline, iframe.contentDocument.timeline);
+    iframe.remove();
+    t.done();
+  }));
+
+  document.body.appendChild(iframe);
+}, 'Element.animate() correctly sets the Animation\'s timeline when ' +
+   'triggered on an element in a different document');
+
+for (const subtest of gAnimationTimelineTests) {
+  test(t => {
+    const anim = createDiv(t).animate(null, { timeline: subtest.timeline });
+    assert_not_equals(anim, null,
+                      'An animation sohuld be created');
+    assert_equals(anim.timeline, subtest.expectedTimeline,
+                  'Animation timeline should be '+
+                  subtest.expectedTimelineDescription);
+  }, 'Element.animate() correctly sets the Animation\'s timeline '
+     + subtest.description + ' in KeyframeAnimationOptions.');
+}
+
+test(t => {
+  const anim = createDiv(t).animate(null, 2000);
+  assert_equals(anim.playState, 'running');
+}, 'Element.animate() calls play on the Animation');
+
+promise_test(async t => {
+  const div = createDiv(t);
+
+  let gotTransition = false;
+  div.addEventListener('transitionrun', () => {
+    gotTransition = true;
+  });
+
+  // Setup transition start point.
+  div.style.transition = 'opacity 100s';
+  getComputedStyle(div).opacity;
+
+  // Update specified style but don't flush style.
+  div.style.opacity = '0.5';
+
+  // Trigger a new animation at the same time.
+  const anim = div.animate({ opacity: [0, 1] }, 100 * MS_PER_SEC);
+
+  // If Element.animate() produces a style change event it will have triggered
+  // a transition.
+  //
+  // If it does NOT produce a style change event, the animation will override
+  // the before-change style and after-change style such that a transition is
+  // never triggered.
+
+  // Wait for the animation to start and then for one more animation
+  // frame to give the transitionrun event a chance to be dispatched.
+  await anim.ready;
+  await waitForAnimationFrames(1);
+
+  assert_false(gotTransition, 'A transition should NOT have been triggered');
+}, 'Element.animate() does NOT trigger a style change event');
+
+// Tests on pseudo-elements
+// Some tests occur twice (on pseudo-elements with and without content)
+// in order to test both code paths for tree-abiding pseudo-elements in blink.
+
+test(t => {
+  const div = createDiv(t);
+  div.classList.add('pseudo');
+  const anim = div.animate(null, {pseudoElement: '::before'});
+  assert_class_string(anim, 'Animation', 'The returned object is an Animation');
+}, 'animate() with pseudoElement parameter creates an Animation object');
+
+test(t => {
+  const div = createDiv(t);
+  const anim = div.animate(null, {pseudoElement: '::before'});
+  assert_class_string(anim, 'Animation', 'The returned object is an Animation');
+}, 'animate() with pseudoElement parameter without content creates an Animation object');
+
+test(t => {
+  const div = createDiv(t);
+  div.classList.add('pseudo');
+  div.style.display = 'list-item';
+  const anim = div.animate(null, {pseudoElement: '::marker'});
+  assert_class_string(anim, 'Animation', 'The returned object is an Animation for ::marker');
+}, 'animate() with pseudoElement parameter creates an Animation object for ::marker');
+
+test(t => {
+  const div = createDiv(t);
+  div.classList.add('pseudo');
+  div.textContent = 'foo';
+  const anim = div.animate(null, {pseudoElement: '::first-line'});
+  assert_class_string(anim, 'Animation', 'The returned object is an Animation for ::first-line');
+}, 'animate() with pseudoElement parameter creates an Animation object for ::first-line');
+
+test(t => {
+  const div = createDiv(t);
+  div.classList.add('pseudo');
+  const anim = div.animate(null, {pseudoElement: '::before'});
+  assert_equals(anim.effect.target, div, 'The returned element has the correct target element');
+  assert_equals(anim.effect.pseudoElement, '::before',
+                'The returned Animation targets the correct selector');
+}, 'animate() with pseudoElement an Animation object targeting ' +
+   'the correct pseudo-element');
+
+test(t => {
+  const div = createDiv(t);
+  const anim = div.animate(null, {pseudoElement: '::before'});
+  assert_equals(anim.effect.target, div, 'The returned element has the correct target element');
+  assert_equals(anim.effect.pseudoElement, '::before',
+                'The returned Animation targets the correct selector');
+}, 'animate() with pseudoElement without content creates an Animation object targeting ' +
+   'the correct pseudo-element');
+
+test(t => {
+  const div = createDiv(t);
+  div.classList.add('pseudo');
+  div.style.display = 'list-item';
+  const anim = div.animate(null, {pseudoElement: '::marker'});
+  assert_equals(anim.effect.target, div, 'The returned element has the correct target element');
+  assert_equals(anim.effect.pseudoElement, '::marker',
+                'The returned Animation targets the correct selector');
+}, 'animate() with pseudoElement an Animation object targeting ' +
+   'the correct pseudo-element for ::marker');
+
+test(t => {
+  const div = createDiv(t);
+  div.classList.add('pseudo');
+  div.textContent = 'foo';
+  const anim = div.animate(null, {pseudoElement: '::first-line'});
+  assert_equals(anim.effect.target, div, 'The returned element has the correct target element');
+  assert_equals(anim.effect.pseudoElement, '::first-line',
+                'The returned Animation targets the correct selector');
+}, 'animate() with pseudoElement an Animation object targeting ' +
+   'the correct pseudo-element for ::first-line');
+
+for (const pseudo of [
+  '',
+  'before',
+  ':abc',
+  '::abc',
+  '::placeholder',
+]) {
+  test(t => {
+    const div = createDiv(t);
+    assert_throws_dom("SyntaxError", () => {
+      div.animate(null, {pseudoElement: pseudo});
+    });
+  }, `animate() with a non-null invalid pseudoElement '${pseudo}' throws a ` +
+     `SyntaxError`);
+}
+
+</script>
+</body>