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<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <script> function draw() { var c = document.getElementById('c').getContext('2d'); c.fillStyle = 'lime'; c.fillRect(0, 0, 200, 100); } </script> </head> <body onload="draw();"> <canvas id='c' width='200' height='100'></canvas> </body> </html>