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chromium/third_party/blink/web_tests/webexposed/web-animations-api.html 

<!DOCTYPE html>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<script>
test(function() {
    assert_true('animate' in Element.prototype);
}, 'Element.animate() should be exposed.');

test(function() {
    assert_true('getAnimations' in Element.prototype);
}, 'Element.getAnimations() should be exposed.')

test(function() {
    assert_true('AnimationTimeline' in window);
},'Timeline should be exposed.');

test(function() {
    assert_true('timeline' in document);
},'document.timeline should be exposed.');
</script>