shouldBe('WebKitAnimationEvent.length', '1');
shouldBe('WebKitCSSMatrix.length', '0');
shouldBe('WebKitMutationObserver.length', '1');
shouldBe('WebKitAnimationEvent.length', '1');
shouldBe('WebKitCSSMatrix.length', '0');
shouldBe('WebKitMutationObserver.length', '1');