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<!DOCTYPE html> <html> <head> <canvas id="canvas" width="100" height="100"></canvas> <script> var canvas = document.getElementById('canvas'); var ctx = canvas.getContext('2d'); ctx.fillStyle = '#0f0'; ctx.fillRect(0, 0, 100, 100); ctx.beginPath(); ctx.rect(30, 30, 40, 40); ctx.clip(); ctx.fillStyle = '#f00'; ctx.fillRect(0, 0, 100, 100); </script> </body></html>