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Chapter 11. Working with Movie Clips > Using movie clips as masks

Using movie clips as masks

You can use a movie clip as a mask to create a hole through which the contents of another movie clip are visible. The mask movie clip plays all the frames in its timeline, the same as a regular movie clip. You can make the mask movie clip draggable, animate it along a motion guide, use separate shapes within a single mask, or resize a mask dynamically. You can also use ActionScript to turn a mask on and off.

You cannot use a mask to mask another mask. You cannot set the _alpha property of a mask movie clip. Only fills are used in a movie clip that is used as a mask; strokes are ignored.


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