Sprite Composition
Composition determines how a sprite is drawn with respect to the background.
Note: When tested with "Chrome Version 46.0.2490.80 m" on Windows 8.1, the 'composition' setting didn't work as expected. However a test
using Chrome on xOS had no problems. Firefox works correctly as well, as does Safari.
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Be aware that many composition operations affect the background so that you can make the background disappear altogether. You usually won't want this - but it can make for some interesting effects.
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