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Free HTML5 Canvas Book
Animating the Canvas Animation is achieved with the following: 1.Clear the area that is changing context.clearRect(x, y, width, height); 2.Save the canvas. - ppt download
HTML5 Canvas: clearRect()
clearRect() method in HTML5 Canvas - wikitechy
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clearRect() method in HTML5 Canvas - wikitechy
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Canvas clearRect: HTML5 - YouTube
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HTML5 Canvas Rectangle - w3resource
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Drawing interactive shapes with the Canvas API in a React application