Raphaël—JavaScript Library. SVG–oids. The United Nations Systems Organization Chart. EaselJS: A Javascript Library for Working with the HTML5 Canvas Element. Canvas Pad. Rectangles (simple shapes) HTML Canvas 2D Context specification: Section 8 Simple shapes (rectangles) context.clearRect(x, y, w, h) Clears all pixels on the canvas in the given rectangle to transparent black. context.fillRect(x, y, w, h) Paints the given rectangle onto the canvas, using the current fill style. context.strokeRect(x, y, w, h)) Paints the box that outlines the given rectangle onto the canvas, using the current stroke style. // Draw black rect ctx.fillRect(50, 20, 145, 145); // Draw blue rect ctx.fillStyle = "rgb(0, 162, 232)"; ctx.fillRect(135, 85, 125, 125); // Increase line width ctx.lineWidth = 5; // Draw black rect outline ctx.strokeStyle = "rgb(0, 0, 0)"; ctx.strokeRect(50, 335, 145, 145); // Draw blue rect outline ctx.strokeStyle = "rgb(0, 162, 232)"; ctx.strokeRect(135, 275, 125, 125); // Draw transparent yellow rect ctx.fillStyle = "rgba(255, 255, 0, 0.75)"; ctx.fillRect(210, 180, 125, 125); context.arc(x, y, radius, startAngle, endAngle, anticlockwise) context.clip()