(Below is one technique to mask content, here are a few more ). Most commonly, groups are useful to keep elements organized and aligned as one unit as you arrange your animation. Groups can also be useful to animate a 2 or more elements in the same way: instead of animating multiple elements with t…

gasspence (Greg) February 18, 2015, 6:08pm 2

You can also use "Grouping" to create a triangular mask or shape by adjusting the border widths and colors of the group container.

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Masking Elements by using Content Overflow & Groups