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By mswatcher
via html5rocks.com
Published: Apr 06 2013 / 02:44

Two commonly used operations in computer graphics are clipping and masking. Both operations hide visual portions of an element. If you have worked with SVG or HTML Canvas before, these operations are probably not new for you. Clipping defines the region of an element that is visible. Everything around this region does not get rendered - it gets "clipped". On masking, a mask image is composited with the element, affecting the alpha channel of this element.
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