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<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Rectangle Example</title> <style> canvas { border: 1px solid black; } </style> </head> <body> <canvas id="rectangleCanvas" width="200" height="200"></canvas> <script> const canvas = document.getElementById('rectangleCanvas'); const ctx = canvas.getContext('2d'); ctx.fillStyle = '#FF0000'; // Set the fill color to red ctx.fillRect(20, 20, 150, 100); // Draw the rectangle </script> </body> </html>