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This code draws a red rectangle on the screen.

The Canvas API also provides save() and restore(), for saving and restoring all the canvas context's attributes.

Canvas element size versus drawing surface size

A canvas actually has two sizes: the size of the element itself and the size of the element's drawing surface. Setting the element's width and height attributes sets both of these sizes; CSS attributes affect only the element's size and not the drawing surface.

By default, both

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