Web Graphics

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- Unlike SVG,  only supports two primitive shapes: rectangles and paths (lists of points connected by lines)
- here are three functions that draw rectangles on the canvas:
- Draws a filled rectangle: [ `fillRect(x, y, width, height)` ](https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/fillRect)
- Draws a rectangular outline: [ `strokeRect(x, y, width, height)` ](https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/strokeRect)
- Clears the specified rectangular area, making it fully transparent.: [ `clearRect(x, y, width, height)` ](https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/clearRect)
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