10. The method of claim 1 , wherein displaying the first identifier in association with the first timeline includes displaying the first identifier and the first timeline in a first row; and wherein displaying the second identifier in association with the second timeline includes displaying the second identifier and the second timeline in a second row.
10. The method of claim 1 , wherein displaying the first identifier in association with the first timeline includes displaying the first identifier and the first timeline in a first row; and wherein displaying the second identifier in association with the second timeline includes displaying the second identifier and the second timeline in a second row. 11. The method of claim 10 , wherein the first row is displayed closer to an edge of a display than the second row to reflect that the first animation object has a higher z-index order than the second animation object.