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Transitions must be blocked so that the initial CSS class can be applied without triggering an animation. Keyframes do not need to be blocked since animations are always triggered on the starting CSS class, however, if a stagger animation is set to occur then all elements for index > 0 should be blocked. This is to prevent the animation from occuring early on before the stagger delay for the given element has passed. With ngAnimate and keyframe animations, IE10 and Safari will render a slight flicker effect caused by the blocking. This fix resolves this issue. Closes #4225