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<!DOCTYPE html> <html> <body> <canvas id="canvas" width="100" height="100"></canvas> <script> var canvas = document.getElementById('canvas'); var ctx = canvas.getContext('2d'); ctx.filter = 'drop-shadow(0 10px black)'; ctx.fillStyle = '#0f0'; ctx.fillRect(25, 25, 50, 40); </script> </body> </html>