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Canvas Pocket Reference provides both a tutorial that covers all of the element's features with plenty of examples and a definitive reference to each of the Canvas-related classes, methods, and properties.

You'll learn how to:

Draw lines, polygons, and curves
Apply colors, gradients, patterns, and transparency
Use transformations to smoothly rotate and resize drawings
Work with text in a graphic environment
Apply shadows to create a sense of depth
Incorporate bitmapped images into vector graphics
Perform image processing operations in JavaScript

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